NATIVE_FIRM and SAFE_MODE_FIRM for the initial versions are exactly the same, besides [[Configuration_Memory|core-version]] fields. When a GBA VC title is launched, AGB_FIRM is launched to handle running this title. GBA VC savegames stored under SD card /title/<TID>/data use a custom format, this is handled by AGB_FIRM.
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NATIVE_FIRM and SAFE_MODE_FIRM for the initial versions are exactly the same, besides [[Configuration_Memory|core-version]] fields. SAFE_MODE_FIRM is used for running SAFE_MODE titles, on retail SAFE_MODE_FIRM seems to be only used for running the [[System_Settings#System_Updater|System Updater]] application. When a GBA VC title is launched, AGB_FIRM is launched to handle running this title. GBA VC savegames stored under SD card /title/<TID>/data use a custom format, this is handled by AGB_FIRM.