Code:
ERROR:Could not find partition 0x0b on /dev/mmcblk0p4
ERROR:Unable to access /dev/mmcblk0p4:Cannot update OS
ERROR:No userstore partition, cannot check for updates.
BOOTING DEFAULT.
That seems to indicate you have been trying to mess with the USER VISIBLE usb accessible storage.
Quote:
When in diags you select USB Mode it just keeps refreshing the display and not doing anything
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That is correct.
It indicates it is waiting for a "fastboot" connection over USB.
NOTE: You must use the proper fastboot tool, these Kindles do not use the same fastboot as an Android machine.