[PROBLEM] Mounting of Backup Image-File not possible

[suhm]

so the problem is here my root/@ and root/@last_good_known snapshots seens to be destroyed.

i want to find another snapshot on my old xbianimage file, like root/@btrfs-auto-snap_daily-2014-06-04-1905 for example.

the actually situation in my oldxbianimage:
root/@ - DESTROYED OR ANYTHING ELSE
root/@btrfs-auto-snap_daily-2015-09-15-19?? - FINE
root/@btrfs-auto-snap_weekly-2015-08-04-????
root/@btrfs-???????????????????????????????
root/@last_good_known - ALSO DESTROYED OR ANYTHING ELSE

So i want to boot with my cmdline.txt the "root/@btrfs-auto-snap_daily-2015-09-15-1905" but this is just an example. i dont know the correct name of the snapshot

PS: im also just trying to add on cmdline.txt rescue oder rescue_early , but no success. my raspberry is catched in a reboot loop