diff --git a/exosphere/src/package2.c b/exosphere/src/package2.c
index c6ef81dc2..706386de3 100644
--- a/exosphere/src/package2.c
+++ b/exosphere/src/package2.c
@@ -144,7 +144,7 @@ static void setup_se(void) {
         decrypt_data_into_keyslot(KEYSLOT_SWITCH_6XTSECROOTKEY, KEYSLOT_SWITCH_6XTSECROOTKEY, new_master_kek_sources[0], 0x10);
         decrypt_data_into_keyslot(KEYSLOT_SWITCH_MASTERKEY, KEYSLOT_SWITCH_6XTSECROOTKEY, masterkey_seed, 0x10);
         decrypt_data_into_keyslot(KEYSLOT_SWITCH_5XNEWDEVICEKEYGENKEY, KEYSLOT_SWITCH_6XTSECROOTKEY, devicekek_4x_seed, 0x10);
-        clear_aes_keyslot(KEYSLOT_SWITCH_6XTSECROOTKEY);
+        clear_aes_keyslot(KEYSLOT_SWITCH_6XTSECROOTKEY);  
     }
 
     /* Detect Master Key revision. */
@@ -346,7 +346,7 @@ static bool validate_package2_metadata(package2_meta_t *metadata) {
 
     /* Perform version checks. */
     /* We will be compatible with all package2s released before current, but not newer ones. */
-    if (metadata->version_max >= PACKAGE2_MINVER_THEORETICAL && metadata->version_min < PACKAGE2_MAXVER_600_CURRENT) {
+    if (metadata->version_max >= PACKAGE2_MINVER_THEORETICAL && metadata->version_min < PACKAGE2_MAXVER_620_CURRENT) {
         return true;
     }
 
@@ -466,6 +466,7 @@ static void copy_warmboot_bin_to_dram() {
             warmboot_src = (uint8_t *)0x4003B000;
             break;
         case EXOSPHERE_TARGET_FIRMWARE_600:
+        case EXOSPHERE_TARGET_FIRMWARE_620:
             warmboot_src = (uint8_t *)0x4003D800;
             break;
     }
diff --git a/exosphere/src/package2.h b/exosphere/src/package2.h
index 9553fa8fe..97ac7638c 100644
--- a/exosphere/src/package2.h
+++ b/exosphere/src/package2.h
@@ -67,7 +67,8 @@ static inline uintptr_t get_nx_bootloader_mailbox_base(void) {
 #define PACKAGE2_MAXVER_302 0x5
 #define PACKAGE2_MAXVER_400_410 0x6
 #define PACKAGE2_MAXVER_500_510 0x7
-#define PACKAGE2_MAXVER_600_CURRENT 0x8
+#define PACKAGE2_MAXVER_600_610 0x8
+#define PACKAGE2_MAXVER_620_CURRENT 0x9
 
 #define PACKAGE2_MINVER_100 0x3
 #define PACKAGE2_MINVER_200 0x4
@@ -75,7 +76,8 @@ static inline uintptr_t get_nx_bootloader_mailbox_base(void) {
 #define PACKAGE2_MINVER_302 0x6
 #define PACKAGE2_MINVER_400_410 0x7
 #define PACKAGE2_MINVER_500_510 0x8
-#define PACKAGE2_MINVER_600_CURRENT 0x9
+#define PACKAGE2_MINVER_600_610 0x9
+#define PACKAGE2_MINVER_620_CURRENT 0xA
 
 typedef struct {
     union {
diff --git a/exosphere/src/smc_api.c b/exosphere/src/smc_api.c
index f391dc539..f39645e47 100644
--- a/exosphere/src/smc_api.c
+++ b/exosphere/src/smc_api.c
@@ -159,6 +159,7 @@ void set_version_specific_smcs(void) {
             break;
         case EXOSPHERE_TARGET_FIRMWARE_500:
         case EXOSPHERE_TARGET_FIRMWARE_600:
+        case EXOSPHERE_TARGET_FIRMWARE_620:
             /* No more LoadSecureExpModKey. */
             g_smc_user_table[0xE].handler = NULL;
             g_smc_user_table[0xC].id = 0xC300D60C;
diff --git a/exosphere/src/smc_user.c b/exosphere/src/smc_user.c
index 5c2b9c2b6..4ebf6369f 100644
--- a/exosphere/src/smc_user.c
+++ b/exosphere/src/smc_user.c
@@ -49,6 +49,7 @@ static bool is_user_keyslot_valid(unsigned int keyslot) {
         case EXOSPHERE_TARGET_FIRMWARE_500:
             return keyslot <= 3;
         case EXOSPHERE_TARGET_FIRMWARE_600:
+        case EXOSPHERE_TARGET_FIRMWARE_620:
         default:
             return keyslot <= 5;
     }
@@ -166,7 +167,7 @@ uint32_t user_generate_aes_kek(smc_args_t *args) {
     /* 5.0.0+ Bounds checking. */
     if (exosphere_get_target_firmware() >= EXOSPHERE_TARGET_FIRMWARE_500) {
         if (is_personalized) {
-            if (master_key_rev > MASTERKEY_REVISION_MAX || (MASTERKEY_REVISION_300 <= master_key_rev + 1 && master_key_rev + 1 < MASTERKEY_REVISION_400_410)) {
+            if (master_key_rev >= MASTERKEY_REVISION_MAX || (MASTERKEY_REVISION_300 <= master_key_rev && master_key_rev < MASTERKEY_REVISION_400_410)) {
                 return 2;
             }
             if (mask_id > 3 || usecase >= CRYPTOUSECASE_MAX_5X) {
diff --git a/fusee/fusee-secondary/src/extkeys.c b/fusee/fusee-secondary/src/extkeys.c
new file mode 100644
index 000000000..7315d4c5d
--- /dev/null
+++ b/fusee/fusee-secondary/src/extkeys.c
@@ -0,0 +1,216 @@
+/*
+ * Copyright (c) 2018 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+ 
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include "extkeys.h"
+
+/**
+ * Reads a line from file f and parses out the key and value from it.
+ * The format of a line must match /^ *[A-Za-z0-9_] *[,=] *.+$/.
+ * If a line ends in \r, the final \r is stripped.
+ * The input file is assumed to have been opened with the 'b' flag.
+ * The input file is assumed to contain only ASCII.
+ *
+ * A line cannot exceed 512 bytes in length.
+ * Lines that are excessively long will be silently truncated.
+ *
+ * On success, *key and *value will be set to point to the key and value in
+ * the input line, respectively.
+ * *key and *value may also be NULL in case of empty lines.
+ * On failure, *key and *value will be set to NULL.
+ * End of file is considered failure.
+ *
+ * Because *key and *value will point to a static buffer, their contents must be
+ * copied before calling this function again.
+ * For the same reason, this function is not thread-safe.
+ *
+ * The key will be converted to lowercase.
+ * An empty key is considered a parse error, but an empty value is returned as
+ * success.
+ *
+ * This function assumes that the file can be trusted not to contain any NUL in
+ * the contents.
+ *
+ * Whitespace (' ', ASCII 0x20, as well as '\t', ASCII 0x09) at the beginning of
+ * the line, at the end of the line as well as around = (or ,) will be ignored.
+ *
+ * @param f the file to read
+ * @param key pointer to change to point to the key
+ * @param value pointer to change to point to the value
+ * @return 0 on success,
+ *         1 on end of file,
+ *         -1 on parse error (line too long, line malformed)
+ *         -2 on I/O error
+ */
+static int get_kv(FILE *f, char **key, char **value) {
+#define SKIP_SPACE(p)   do {\
+    for (; *p == ' ' || *p == '\t'; ++p)\
+        ;\
+} while(0);
+    static char line[1024];
+    char *k, *v, *p, *end;
+
+    *key = *value = NULL;
+
+    errno = 0;
+    if (fgets(line, (int)sizeof(line), f) == NULL) {
+        if (feof(f))
+            return 1;
+        else
+            return -2;
+    }
+    if (errno != 0)
+        return -2;
+
+    if (*line == '\n' || *line == '\r' || *line == '\0')
+        return 0;
+
+    /* Not finding \r or \n is not a problem.
+     * The line might just be exactly 512 characters long, we have no way to
+     * tell.
+     * Additionally, it's possible that the last line of a file is not actually
+     * a line (i.e., does not end in '\n'); we do want to handle those.
+     */
+    if ((p = strchr(line, '\r')) != NULL || (p = strchr(line, '\n')) != NULL) {
+        end = p;
+        *p = '\0';
+    } else {
+        end = line + strlen(line) + 1;
+    }
+
+    p = line;
+    SKIP_SPACE(p);
+    k = p;
+
+    /* Validate key and convert to lower case. */
+    for (; *p != ' ' && *p != ',' && *p != '\t' && *p != '='; ++p) {
+        if (*p == '\0')
+            return -1;
+
+        if (*p >= 'A' && *p <= 'Z') {
+            *p = 'a' + (*p - 'A');
+            continue;
+        }
+
+        if (*p != '_' &&
+                (*p < '0' || *p > '9') &&
+                (*p < 'a' || *p > 'z')) {
+            return -1;
+        }
+    }
+
+    /* Bail if the final ++p put us at the end of string */
+    if (*p == '\0')
+        return -1;
+
+    /* We should be at the end of key now and either whitespace or [,=]
+     * follows.
+     */
+    if (*p == '=' || *p == ',') {
+        *p++ = '\0';
+    } else {
+        *p++ = '\0';
+        SKIP_SPACE(p);
+        if (*p != '=' && *p != ',')
+            return -1;
+        *p++ = '\0';
+    }
+
+    /* Empty key is an error. */
+    if (*k == '\0')
+        return -1;
+
+    SKIP_SPACE(p);
+    v = p;
+
+    /* Skip trailing whitespace */
+    for (p = end - 1; *p == '\t' || *p == ' '; --p)
+        ;
+
+    *(p + 1) = '\0';
+
+    *key = k;
+    *value = v;
+
+    return 0;
+#undef SKIP_SPACE
+}
+
+static int ishex(char c) {
+    if ('a' <= c && c <= 'f') return 1;
+    if ('A' <= c && c <= 'F') return 1;
+    if ('0' <= c && c <= '9') return 1;
+    return 0;
+}
+
+static char hextoi(char c) {
+    if ('a' <= c && c <= 'f') return c - 'a' + 0xA;
+    if ('A' <= c && c <= 'F') return c - 'A' + 0xA;
+    if ('0' <= c && c <= '9') return c - '0';
+    return 0;
+}
+
+void parse_hex_key(unsigned char *key, const char *hex, unsigned int len) {
+    if (strlen(hex) != 2 * len) {
+        fatal_error("Key (%s) must be %x hex digits!\n", hex, 2 * len);
+    }
+
+    for (unsigned int i = 0; i < 2 * len; i++) {
+        if (!ishex(hex[i])) {
+            fatal_error("Key (%s) must be %x hex digits!\n", hex, 2 * len);
+        }
+    }
+
+    memset(key, 0, len);
+
+    for (unsigned int i = 0; i < 2 * len; i++) {
+        char val = hextoi(hex[i]);
+        if ((i & 1) == 0) {
+            val <<= 4;
+        }
+        key[i >> 1] |= val;
+    }
+}
+
+void extkeys_initialize_keyset(fusee_extkeys_t *keyset, FILE *f) {
+    char *key, *value;
+    int ret;
+    
+    while ((ret = get_kv(f, &key, &value)) != 1 && ret != -2) {
+        if (ret == 0) {
+            if (key == NULL || value == NULL) {
+                continue;
+            }
+            int matched_key = 0;
+            if (strcmp(key, "tsec_root_key") == 0 || strcmp(key, "tsec_root_key_00") == 0) {
+                parse_hex_key(keyset->tsec_root_key, value, sizeof(keyset->tsec_root_key));
+                matched_key = 1;
+            } else {
+                char test_name[0x100] = {0};
+                for (unsigned int i = 0; i < 0x20 && !matched_key; i++) { 
+                    snprintf(test_name, sizeof(test_name), "master_kek_%02x", i);
+                    if (strcmp(key, test_name) == 0) {
+                        parse_hex_key(keyset->master_keks[i], value, sizeof(keyset->master_keks[i]));
+                        matched_key = 1;
+                        break;
+                    }
+                }
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/fusee/fusee-secondary/src/extkeys.h b/fusee/fusee-secondary/src/extkeys.h
new file mode 100644
index 000000000..651868995
--- /dev/null
+++ b/fusee/fusee-secondary/src/extkeys.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2018 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+ 
+#ifndef FUSEE_EXTKEYS_H
+#define FUSEE_EXTKEYS_H
+
+#include <string.h>
+#include "utils.h"
+#include "masterkey.h"
+
+typedef struct {
+    unsigned char tsec_root_key[0x10];
+    unsigned char master_keks[0x20][0x10];
+} fusee_extkeys_t;
+
+void parse_hex_key(unsigned char *key, const char *hex, unsigned int len);
+void extkeys_initialize_keyset(fusee_extkeys_t *keyset, FILE *f);
+
+#endif
\ No newline at end of file
diff --git a/fusee/fusee-secondary/src/key_derivation.c b/fusee/fusee-secondary/src/key_derivation.c
index 825bc9d3e..b997e32a7 100644
--- a/fusee/fusee-secondary/src/key_derivation.c
+++ b/fusee/fusee-secondary/src/key_derivation.c
@@ -13,13 +13,15 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
- 
+
+#include <stdio.h>
 #include "key_derivation.h"
 #include "masterkey.h"
 #include "se.h"
 #include "exocfg.h"
 #include "fuse.h"
 #include "tsec.h"
+#include "extkeys.h"
 #include "utils.h"
 
 #define AL16 ALIGN(16)
@@ -53,6 +55,10 @@ static const uint8_t AL16 masterkey_4x_seed[0x10] = {
     0x2D, 0xC1, 0xF4, 0x8D, 0xF3, 0x5B, 0x69, 0x33, 0x42, 0x10, 0xAC, 0x65, 0xDA, 0x90, 0x46, 0x66
 };
 
+static const uint8_t AL16 new_master_kek_seeds[1][0x10] = {
+    {0x37, 0x4B, 0x77, 0x29, 0x59, 0xB4, 0x04, 0x30, 0x81, 0xF6, 0xE5, 0x8C, 0x6D, 0x36, 0x17, 0x9A}, /* MasterKek seed 06. */
+};
+
 static nx_dec_keyblob_t AL16 g_dec_keyblobs[32];
 
 static int get_tsec_key(void *dst, const void *tsec_fw, size_t tsec_fw_size, uint32_t tsec_key_id) {
@@ -108,45 +114,79 @@ static int decrypt_keyblob(const nx_keyblob_t *keyblobs, uint32_t revision, uint
 }
 
 int load_package1_key(uint32_t revision) {
-    if (revision > MASTERKEY_REVISION_600_CURRENT) {
+    if (revision > MASTERKEY_REVISION_600_610) {
         return -1;
     }
     
-    set_aes_keyslot(0xB, g_dec_keyblobs[revision].keys[8], 0x10);
+    set_aes_keyslot(0xB, g_dec_keyblobs[revision].package1_key, 0x10);
     return 0;
 }
 
 /* Derive all Switch keys. */
-int derive_nx_keydata(uint32_t target_firmware, const nx_keyblob_t *keyblobs, uint32_t available_revision, const void *tsec_fw, size_t tsec_fw_size) {
+int derive_nx_keydata(uint32_t target_firmware, const nx_keyblob_t *keyblobs, uint32_t available_revision, const void *tsec_fw, size_t tsec_fw_size, unsigned int *out_keygen_type) {
+    uint8_t AL16 tsec_key[0x10];
     uint8_t AL16 work_buffer[0x10];
+    uint8_t AL16 zeroes[0x10] = {0};
 
     /* TODO: Set keyslot flags properly in preparation of derivation. */
     set_aes_keyslot_flags(0xE, 0x15);
     set_aes_keyslot_flags(0xD, 0x15);
 
     /* Set TSEC key. */
-    if (get_tsec_key(work_buffer, tsec_fw, tsec_fw_size, 1) != 0) {
+    if (get_tsec_key(tsec_key, tsec_fw, tsec_fw_size, 1) != 0) {
         return -1;
     }
     
-    set_aes_keyslot(0xD, work_buffer, 0x10);
-    
+    set_aes_keyslot(0xD, tsec_key, 0x10);
+        
     /* Decrypt all keyblobs, setting keyslot 0xF correctly. */
-    for (unsigned int rev = 0; rev < MASTERKEY_REVISION_MAX; rev++) {
+    for (unsigned int rev = 0; rev <= MASTERKEY_REVISION_600_610; rev++) {
         int ret = decrypt_keyblob(keyblobs, rev, available_revision);
         if (ret) {
             return ret;
         }
     }
-
+    
+    
+    /* TODO: Eventually do 6.2.0+ keygen properly? */
+    *out_keygen_type = 0;
+    if (target_firmware >= EXOSPHERE_TARGET_FIRMWARE_620) {
+        const char *keyfile = fuse_get_retail_type() != 0 ? "atmosphere/prod.keys" : "atmosphere/dev.keys";
+        FILE *extkey_file = fopen(keyfile, "r");
+        AL16 fusee_extkeys_t extkeys = {0};
+        if (extkey_file == NULL) {
+            fatal_error("Error: failed to read %s, needed for 6.2.0+ key derivation!", keyfile);
+        }
+        extkeys_initialize_keyset(&extkeys, extkey_file);
+        fclose(extkey_file);
+        
+        if (memcmp(extkeys.tsec_root_key, zeroes, 0x10) != 0) {
+            set_aes_keyslot(0xC, extkeys.tsec_root_key, 0x10);
+            for (unsigned int rev = MASTERKEY_REVISION_620_CURRENT; rev < MASTERKEY_REVISION_MAX; rev++) {
+                se_aes_ecb_decrypt_block(0xC, work_buffer, 0x10, new_master_kek_seeds[rev - MASTERKEY_REVISION_620_CURRENT], 0x10);
+                memcpy(g_dec_keyblobs[rev].master_kek, work_buffer, 0x10);
+            }
+        } else {
+            for (unsigned int rev = MASTERKEY_REVISION_620_CURRENT; rev < MASTERKEY_REVISION_MAX; rev++) {
+                memcpy(g_dec_keyblobs[rev].master_kek, extkeys.master_keks[rev], 0x10);
+            }
+        }
+        
+        if (memcmp(g_dec_keyblobs[available_revision].master_kek, zeroes, 0x10) == 0) {
+            fatal_error("Error: failed to derive master_kek_%02x!", available_revision);
+        }
+    }
+    
     /* Clear the SBK. */
     clear_aes_keyslot(0xE);
 
     /* Get needed data. */
-    set_aes_keyslot(0xC, g_dec_keyblobs[MASTERKEY_REVISION_600_CURRENT].keys[0], 0x10);
+    set_aes_keyslot(0xC, g_dec_keyblobs[available_revision].master_kek, 0x10);
 
     /* Also set the Package1 key for the revision that is stored on the eMMC boot0 partition. */
-    load_package1_key(available_revision);
+    if (target_firmware < EXOSPHERE_TARGET_FIRMWARE_620) {
+        load_package1_key(available_revision);
+    }
 
     /* Derive keys for Exosphere, lock critical keyslots. */
     switch (target_firmware) {
@@ -164,6 +204,7 @@ int derive_nx_keydata(uint32_t target_firmware, const nx_keyblob_t *keyblobs, ui
             break;
         case EXOSPHERE_TARGET_FIRMWARE_500:
         case EXOSPHERE_TARGET_FIRMWARE_600:
+        case EXOSPHERE_TARGET_FIRMWARE_620:
             decrypt_data_into_keyslot(0xA, 0xF, devicekey_4x_seed, 0x10);
             decrypt_data_into_keyslot(0xF, 0xF, devicekey_seed, 0x10);
             decrypt_data_into_keyslot(0xE, 0xC, masterkey_4x_seed, 0x10);
diff --git a/fusee/fusee-secondary/src/key_derivation.h b/fusee/fusee-secondary/src/key_derivation.h
index 5b64f76d1..0cc475037 100644
--- a/fusee/fusee-secondary/src/key_derivation.h
+++ b/fusee/fusee-secondary/src/key_derivation.h
@@ -28,7 +28,14 @@ typedef enum BisPartition {
 } BisPartition;
 
 typedef struct {
-    uint8_t keys[9][0x10];
+    union {
+        uint8_t keys[9][0x10];
+        struct {
+            uint8_t master_kek[0x10];
+            uint8_t _keys[7][0x10];
+            uint8_t package1_key[0x10];
+        };
+    };
 } nx_dec_keyblob_t;
 
 typedef struct nx_keyblob_t {
@@ -40,7 +47,7 @@ typedef struct nx_keyblob_t {
     };
 } nx_keyblob_t;
 
-int derive_nx_keydata(uint32_t target_firmware, const nx_keyblob_t *keyblobs, uint32_t available_revision, const void *tsec_fw, size_t tsec_fw_size);
+int derive_nx_keydata(uint32_t target_firmware, const nx_keyblob_t *keyblobs, uint32_t available_revision, const void *tsec_fw, size_t tsec_fw_size, unsigned int *out_keygen_type);
 int load_package1_key(uint32_t revision);
 void finalize_nx_keydata(uint32_t target_firmware);
 void derive_bis_key(void *dst, BisPartition partition_id, uint32_t target_firmware);
diff --git a/fusee/fusee-secondary/src/masterkey.c b/fusee/fusee-secondary/src/masterkey.c
index bf31ec581..3a4f6ae71 100644
--- a/fusee/fusee-secondary/src/masterkey.c
+++ b/fusee/fusee-secondary/src/masterkey.c
@@ -26,7 +26,6 @@ static unsigned int g_mkey_revision = 0;
 static bool g_determined_mkey_revision = false;
 
 static uint8_t g_old_masterkeys[MASTERKEY_REVISION_MAX][0x10];
-static uint8_t g_old_devicekeys[MASTERKEY_NUM_NEW_DEVICE_KEYS - 1][0x10];
 
 /* TODO: Extend with new vectors, as needed. */
 /* Dev unit keys. */
@@ -38,6 +37,7 @@ static const uint8_t mkey_vectors_dev[MASTERKEY_REVISION_MAX][0x10] =
     {0x2C, 0xCA, 0x9C, 0x31, 0x1E, 0x07, 0xB0, 0x02, 0x97, 0x0A, 0xD8, 0x03, 0xA2, 0x76, 0x3F, 0xA3}, /* Master key 02 encrypted with Master key 03. */
     {0x9B, 0x84, 0x76, 0x14, 0x72, 0x94, 0x52, 0xCB, 0x54, 0x92, 0x9B, 0xC4, 0x8C, 0x5B, 0x0F, 0xBA}, /* Master key 03 encrypted with Master key 04. */
     {0x78, 0xD5, 0xF1, 0x20, 0x3D, 0x16, 0xE9, 0x30, 0x32, 0x27, 0x34, 0x6F, 0xCF, 0xE0, 0x27, 0xDC}, /* Master key 04 encrypted with Master key 05. */
+    {0x6F, 0xD2, 0x84, 0x1D, 0x05, 0xEC, 0x40, 0x94, 0x5F, 0x18, 0xB3, 0x81, 0x09, 0x98, 0x8D, 0x4E}, /* Master key 05 encrypted with Master key 06. */
 };
 
 /* Retail unit keys. */
@@ -49,6 +49,7 @@ static const uint8_t mkey_vectors[MASTERKEY_REVISION_MAX][0x10] =
     {0x0A, 0x0D, 0xDF, 0x34, 0x22, 0x06, 0x6C, 0xA4, 0xE6, 0xB1, 0xEC, 0x71, 0x85, 0xCA, 0x4E, 0x07}, /* Master key 02 encrypted with Master key 03. */
     {0x6E, 0x7D, 0x2D, 0xC3, 0x0F, 0x59, 0xC8, 0xFA, 0x87, 0xA8, 0x2E, 0xD5, 0x89, 0x5E, 0xF3, 0xE9}, /* Master key 03 encrypted with Master key 04. */
     {0xEB, 0xF5, 0x6F, 0x83, 0x61, 0x9E, 0xF8, 0xFA, 0xE0, 0x87, 0xD7, 0xA1, 0x4E, 0x25, 0x36, 0xEE}, /* Master key 04 encrypted with Master key 05. */
+    {0x1E, 0x1E, 0x22, 0xC0, 0x5A, 0x33, 0x3C, 0xB9, 0x0B, 0xA9, 0x03, 0x04, 0xBA, 0xDB, 0x07, 0x57}, /* Master key 05 encrypted with Master key 06. */
 };
 
 static bool check_mkey_revision(unsigned int revision, bool is_retail) {
@@ -119,33 +120,3 @@ unsigned int mkey_get_keyslot(unsigned int revision) {
         return KEYSLOT_SWITCH_TEMPKEY;
     }
 }
-
-void set_old_devkey(unsigned int revision, const uint8_t *key) {
-    if (revision < MASTERKEY_REVISION_400_410 || MASTERKEY_REVISION_600_CURRENT <= revision) {
-        generic_panic();
-    }
-
-    memcpy(g_old_devicekeys[revision - MASTERKEY_REVISION_400_410], key, 0x10);
-}
-
-unsigned int devkey_get_keyslot(unsigned int revision) {
-    if (!g_determined_mkey_revision || revision >= MASTERKEY_REVISION_MAX) {
-        generic_panic();
-    }
-
-    if (revision > g_mkey_revision) {
-        generic_panic();
-    }
-
-    if (revision >= 1) {
-        if (revision == MASTERKEY_REVISION_600_CURRENT) {
-            return KEYSLOT_SWITCH_DEVICEKEY;
-        } else {
-            /* Load into a temp keyslot. */
-            set_aes_keyslot(KEYSLOT_SWITCH_TEMPKEY, g_old_devicekeys[revision - MASTERKEY_REVISION_400_410], 0x10);
-            return KEYSLOT_SWITCH_TEMPKEY;
-        }
-    } else {
-        return KEYSLOT_SWITCH_4XOLDDEVICEKEY;
-    }
-}
\ No newline at end of file
diff --git a/fusee/fusee-secondary/src/masterkey.h b/fusee/fusee-secondary/src/masterkey.h
index 531eebc58..0f1c20a0b 100644
--- a/fusee/fusee-secondary/src/masterkey.h
+++ b/fusee/fusee-secondary/src/masterkey.h
@@ -19,15 +19,16 @@
 
 /* This is glue code to enable master key support across versions. */
 
-/* TODO: Update to 0x7 on release of new master key. */
-#define MASTERKEY_REVISION_MAX 0x6
+/* TODO: Update to 0x8 on release of new master key. */
+#define MASTERKEY_REVISION_MAX 0x7
 
 #define MASTERKEY_REVISION_100_230     0x00
 #define MASTERKEY_REVISION_300         0x01
 #define MASTERKEY_REVISION_301_302     0x02
 #define MASTERKEY_REVISION_400_410     0x03
 #define MASTERKEY_REVISION_500_510     0x04
-#define MASTERKEY_REVISION_600_CURRENT 0x05
+#define MASTERKEY_REVISION_600_610     0x05
+#define MASTERKEY_REVISION_620_CURRENT 0x06
 
 #define MASTERKEY_NUM_NEW_DEVICE_KEYS (MASTERKEY_REVISION_MAX - MASTERKEY_REVISION_400_410)
 
diff --git a/fusee/fusee-secondary/src/nxboot.c b/fusee/fusee-secondary/src/nxboot.c
index 0380b3544..4851d3e3b 100644
--- a/fusee/fusee-secondary/src/nxboot.c
+++ b/fusee/fusee-secondary/src/nxboot.c
@@ -90,12 +90,16 @@ static uint32_t nxboot_get_target_firmware(const void *package1loader) {
     }
 }
 
-static void nxboot_configure_exosphere(uint32_t target_firmware) {
+static void nxboot_configure_exosphere(uint32_t target_firmware, unsigned int keygen_type) {
     exosphere_config_t exo_cfg = {0};
 
     exo_cfg.magic = MAGIC_EXOSPHERE_BOOTCONFIG;
     exo_cfg.target_firmware = target_firmware;
-    exo_cfg.flags = EXOSPHERE_FLAGS_DEFAULT;
+    if (keygen_type) {
+        exo_cfg.flags = EXOSPHERE_FLAGS_DEFAULT | EXOSPHERE_FLAG_PERFORM_620_KEYGEN;
+    } else {
+        exo_cfg.flags = EXOSPHERE_FLAGS_DEFAULT;
+    }
 
     if (ini_parse_string(get_loader_ctx()->bct0, exosphere_ini_handler, &exo_cfg) < 0) {
         fatal_error("[NXBOOT]: Failed to parse BCT.ini!\n");
@@ -307,8 +311,14 @@ uint32_t nxboot_main(void) {
     
     print(SCREEN_LOG_LEVEL_MANDATORY, "[NXBOOT]: Loaded firmware from eMMC...\n");
 
+    /* Derive keydata. */
+    unsigned int keygen_type = 0;
+    if (derive_nx_keydata(target_firmware, g_keyblobs, available_revision, tsec_fw, tsec_fw_size, &keygen_type) != 0) {
+        fatal_error("[NXBOOT]: Key derivation failed!\n");
+    }
+
     /* Setup boot configuration for Exosphère. */
-    nxboot_configure_exosphere(target_firmware);
+    nxboot_configure_exosphere(target_firmware, keygen_type);
 
     /* Initialize Boot Reason on older firmware versions. */
     if (MAILBOX_EXOSPHERE_CONFIGURATION->target_firmware < EXOSPHERE_TARGET_FIRMWARE_400) {
@@ -316,11 +326,6 @@ uint32_t nxboot_main(void) {
         nxboot_set_bootreason();
     }
 
-    /* Derive keydata. */
-    if (derive_nx_keydata(MAILBOX_EXOSPHERE_CONFIGURATION->target_firmware, g_keyblobs, available_revision, tsec_fw, tsec_fw_size) != 0) {
-        fatal_error("[NXBOOT]: Key derivation failed!\n");
-    }
-
     /* Read the warmboot firmware from a file, otherwise from PK1. */
     if (loader_ctx->warmboot_path[0] != '\0') {
         warmboot_fw_size = get_file_size(loader_ctx->warmboot_path);
diff --git a/fusee/fusee-secondary/src/package2.c b/fusee/fusee-secondary/src/package2.c
index 1d2fb3a5c..1f9cdad9b 100644
--- a/fusee/fusee-secondary/src/package2.c
+++ b/fusee/fusee-secondary/src/package2.c
@@ -214,7 +214,7 @@ static bool package2_validate_metadata(package2_meta_t *metadata, uint8_t data[]
 
     /* Perform version checks. */
     /* We will be compatible with all package2s released before current, but not newer ones. */
-    if (metadata->version_max >= PACKAGE2_MINVER_THEORETICAL && metadata->version_min < PACKAGE2_MAXVER_600_CURRENT) {
+    if (metadata->version_max >= PACKAGE2_MINVER_THEORETICAL && metadata->version_min < PACKAGE2_MAXVER_620_CURRENT) {
         return true;
     }
 
diff --git a/fusee/fusee-secondary/src/package2.h b/fusee/fusee-secondary/src/package2.h
index c1314305b..b537f670d 100644
--- a/fusee/fusee-secondary/src/package2.h
+++ b/fusee/fusee-secondary/src/package2.h
@@ -34,7 +34,8 @@
 #define PACKAGE2_MAXVER_302 0x5
 #define PACKAGE2_MAXVER_400_410 0x6
 #define PACKAGE2_MAXVER_500_510 0x7
-#define PACKAGE2_MAXVER_600_CURRENT 0x8
+#define PACKAGE2_MAXVER_600_610 0x8
+#define PACKAGE2_MAXVER_620_CURRENT 0x9
 
 #define PACKAGE2_MINVER_100 0x3
 #define PACKAGE2_MINVER_200 0x4
@@ -42,7 +43,8 @@
 #define PACKAGE2_MINVER_302 0x6
 #define PACKAGE2_MINVER_400_410 0x7
 #define PACKAGE2_MINVER_500_510 0x8
-#define PACKAGE2_MINVER_600_CURRENT 0x9
+#define PACKAGE2_MINVER_600_610 0x9
+#define PACKAGE2_MINVER_620_CURRENT 0xA
 
 #define NX_BOOTLOADER_PACKAGE2_LOAD_ADDRESS ((void *)(0xA9800000ull))