diff --git a/bdk/usb/usb_gadget_ums.c b/bdk/usb/usb_gadget_ums.c
index f411f46..6a9831f 100644
--- a/bdk/usb/usb_gadget_ums.c
+++ b/bdk/usb/usb_gadget_ums.c
@@ -1774,16 +1774,16 @@ static inline void _system_maintainance(usbd_gadget_ums_t *ums)
 
 	u32 time = get_tmr_ms();
 
-	if (timer_dram < time)
-	{
-		minerva_periodic_training();
-		timer_dram = get_tmr_ms() + 100;
-	}
-	else if (timer_status_bar < time)
+	if (timer_status_bar < time)
 	{
 		ums->system_maintenance(true);
 		timer_status_bar = get_tmr_ms() + 30000;
 	}
+	else if (timer_dram < time)
+	{
+		minerva_periodic_training();
+		timer_dram = get_tmr_ms() + EMC_PERIODIC_TRAIN_MS;
+	}
 }
 
 int usb_device_gadget_ums(usb_ctxt_t *usbs)
diff --git a/nyx/nyx_gui/frontend/gui_tools.c b/nyx/nyx_gui/frontend/gui_tools.c
index d2bd51b..8a2d132 100644
--- a/nyx/nyx_gui/frontend/gui_tools.c
+++ b/nyx/nyx_gui/frontend/gui_tools.c
@@ -293,8 +293,14 @@ static lv_res_t _create_mbox_ums(usb_ctxt_t *usbs)
 	lv_obj_align(mbox, NULL, LV_ALIGN_CENTER, 0, 0);
 	lv_obj_set_top(mbox, true);
 
+	// Dim backlight.
+	display_backlight_brightness(20, 1000);
+
 	usb_device_gadget_ums(usbs);
 
+	// Restore backlight.
+	display_backlight_brightness(h_cfg.backlight - 20, 1000);
+
 	lv_mbox_add_btns(mbox, mbox_btn_map2, mbox_action);
 
 	ums_mbox = dark_bg;