i turned off the phone last night to make a backup of it with backup menu and this morning i cannot boot it (endless loop).
i suspect that it has something to do with my last boot where i had to pull the battery out and return it (power button did not

shut it down)

when trying to restore optfs from backupmenu (any image) i get the following message:

----
Mounting the optFS...
Error: cannot mount the OptFS.
try using fsck mode and see if that fixes it.
---

Other things i noticed:

root console is not working - i get a constant black screen when starting it
i can backup and restore the RootFS normally without any problems
my optfs is of type ext4 4GB (for almost a year now)
i did not install/upgrade anything since my last reboot which was a few hours earlier (and booted normally)

next step i did is reflashing the device with nokia's image - the flash was successful and the device booted.
i then installe rootsh and backupmenu with app manager, and tried to reformat the optfs (which was not mounted after boot - i

checked with "mount" command) from the x-terminal:

mkfs.ext4 /dev/mmcblk0p2

this went successfuly - after boot i can see that optfs is mounted to /home (the file system is recognized as ext3 though) so

this is not a hardware issue.

even after this - i am unable to get to a place where i am able to restore my backed up optfs image (the image itself is not the problem since the message is about the mount itself, and also - i tried extracting previous images also and got the same message)

any ideas on how to fix/proceed with this will be more than welcome.

i was sure that i tried this scenario before, but somehow i did it now and it fixed the issue:

flashed the root backupmenu image
restored my backed up rootf image only
boot again to (restored) backupmenu
restored the optfs image - no mount errors now
boot and device restored.

hope it'll help if someone ever gets crossed with such an issue.

I had exactly the same problem and I confirm this method worked for me too. (And I feel kind of released)