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* Oak Flash memory breakdown

OakBoot
Config
User Rom Slot 1
User Rom Slot 2
(Find link on forum elaborating on this further)

* Factory fresh Oak is looking for system firmware in slot 0 - Serial uploads always go to slot 0 - no matter what is in that slot. A factory Oak boots to 0 looking for the system firmware, which is why before uploading via serial I instruct people to do a factory restore, so that the Oak is booting to 0 which is where you are putting the code. Once your done using serial uploads for testing/debugging/etc you'd want to restore back to factory or at least put a system image on it over serial so that it is at slot 0.

https://digistump.com/board/index.php/topic,2068.msg9450.html#msg9450

* Oak Bootup process

OakBoot -> If P1 GND -> Config ROM
        -> Else      -> User ROM (last successfully flashed)

* Link to another page about disaster recovery for Oaks, which will be heavily based on kh's notes https://digistump.com/board/index.php/topic,2381.msg11296.html#msg11296