Dear Butters,
1. 1651.
2. When flashing with modded_boot, it is displayed in UPDATER.EXE as O600, after flashing and rebooting and reconnecting it is displayed as O750 in UPDATER.EXE.
The model name does not appear on the screen.
P.S. During flashing with modded_boot, when it is defined as O600, the GARMIN splash screen appears.
3. Sorry, I didn't understand what you meant.

Spoiler: SCREEN
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