@pali
First of all thanks for the fast answer.

$ flasher-3.5 -i wasnt working this is why i tried cold flashing
I was already using the commands you refered me to, but still wasn't able to either flash with --flash-only=nolo nor do a normal flash.
Also my N900 doesn't enter flashing mode afterwards, if i plug it in again while holding u.
This is why i was asking if im missing something, after i have completed your steps (like waiting for the Phone to reboot or something).

Btw battery is fully charged using a second N900.

P.S. i just noticed that this thread was in the General Section even if it would better fit into the N900 Section sorry for posting in it.