Zero free space on LtAP mini

Subj. prevents the upgrade. RouterOS 6.45.3, tried to reboot and update firmware - output is the same.

/system sup-output

stops at 1% progress.

As you can see from the screenshot, there are no files accessible to a user. Questions:

  • Does anyone know what has happened here?
  • Any chances to get around it without NetInstall?