Original post: [SOLVED, BUT DON'T SHUT THREAD FOR NOW] Boot loop after "apt-get upgrade"

Regret to ask again for the same prob, but my N900 isn't booting YET AGAIN because of the libXau problem which was once solved a month ago...
As original post suggested I disabled Extras-devel for better stability BUT forgot to equip backupmenu again... Then today I cleared some rootfs (in normal ways which proved to be OK before) did a normal "apt-get upgrade" and a lot of wares got updated and reboot and... stuck. Even before 5 white dots appear, the LED behaves like when you shut down and fades... Same phenomenon as previously met.
Now I decided to use the same method for this prob so I used the same flasher-3.5 command to boot into RescueOS, found here: N900 rescue OS - testing releasebut WTF it wasn't the same process from the beginning: stuck at a line:

"[6.392944] OMAP SSI hw driver loaded"

...and never went on for a bit. Tried changing Rescue OS image and won't work.

...
EDIT: Shoot, looks like the prob is simply an empty battery... Yes the same phenomenon as the libXau6 problem... Charged and everything's fine now.
Plus a tip: RescueOS won't boot (stuck at above lines) when battery's empty!