Back to thread topic.
What I am thinking, is that it might be possible to switch USB modes, so that the device will expose its NAND thru USB, and allow us to mount it in linux.
Then, following that, we could restore the device partitions, from a copy of a working device. Or, in Jolla C, perhaps from thoise backup partitions.

I didnt test, but perhaps Jolla exposes more modes in this condition. Like it was found for Samnsung devices, which exposed 2 modes, allowing to access the modem, make calls, etc.

https://github.com/ud2/advisories/tr...ocve-2016-0004

Tells how this was done on Samsung devices.
And


https://github.com/ud2/advisories/bl.../usbswitcher.c

Have a exploit that might be modifiable to work (if more modes avail).