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It's still under warranty, so I can attempt return.
Just need a confirmation that it failed not because of our experiments, but on its own.
This means we should at least run for 3h without problems before reporting success.
Regarding the bootloader, do you have a version which always starts RB from the SDcard?The mount_SDonly patch you gave me still loads the firmware from internal memory AFAIK.
If you have the normal bootloader installed I think bootloader USB mode should work. If you plug into USB while the player is off and the select button is held down, USB should work.
In warranty can be denied since you have replaced original firmware to rockbox.
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