In my opinion, formatting rootfs isn't worth it and probably won't work anyway, because the partition is marked as in use by ubifs - at least, I couldn't get any of nandwrite, ubirmvol, ubimkvol to do anything. Also, if we completely nuke rootfs and then the battery dies or we reboot by accident then we're hosed, as BackupMenu itself wouldn't load (until such a time as Fabry hopefully gets a u-boot version to work - I'd love to try myself, but I'm snowed under at the moment). Of course, the ideal solution would be to get BackupMenu to use fiasco-flasher or similar instead, as this would do exactly what flasher-3.5 does with the -r argument, but I'm not sure it's possible to do this as my previous attempts have failed.