To summarize possible ways to 'recover restore' Jolla:

1. We have images. Those can be restored using dd
a. On a working device in terminal. Allthough, this will give issues on some partitions, but, bootloader can be restored this way.
b. fastboot custom kernel with telnet access and using dd to restore backked up images.

2. Possibly using QPST tool (Windows, or perhaps Python script)
a. Not sure, but seems like images we have can be used restoring partitions. Windows only, unless Python tool can be used.

3. fastboot restoring images from SD-Card
a. There seems to be this option if entering fastboot mode without USB connected. We need to figure out what is expected on SD card here.

4. custom recovery
a. Jolla already made a simple recovery option to factory reset device. Can we create similar with backup/restore options etc.