"Your data may be corrupt": /e/os booting into recovery and crashing on startup after running out of disk space

[AnotherElk]

@santa-klaus

Do I understand that this relies on me having done this steps prior to the problem appearing?

Yes.

@santa-klaus

I used the easy installer, from what I understood this is the stable branch.

Correct.

@santa-klaus

After that I have applied a couple of OTA updates, but I assume they don’t switch branch.

Correct.

@santa-klaus

Does installing the same version with ADB sideload have a change to let me recover the data, or is that impossible through this way?

Installing an OS update via the OTA updater or via ADB Sideload does not affect the data partition holding the user data at all.
User data will be deleted by using the Easy Installer, by issuing command line commands to wipe the data partition (aka userdata), by unlocking the bootloader (forcing a factory reset for security reasons) or by locking the bootloader (forcing a factory reset for security reasons).

@santa-klaus

Do you have any ideas on how to either activate usb-debugging or stopping the phone from rebooting?

Did you try to boot into safe mode? The shutdown menu should be available before unlocking the SIM card …

[HOWTO] Reboot into Safe Mode

If you need, you can reboot your device into the “Safe Mode”. This will just deactivate all applications you have installed, and let you use everything else. So for instance, if an app causes big trouble in your phone, you can go into that mode and delete this app through Settings > Applications. Not the best example but you see the point. Once you reboot, everything will be back to normal, you won’t loose any data. BUT, here is a list of issues : Your icon management in the Home Screen will…