Comment # 31 on bug 1202707 from B

(In reply to Stefan Dirsch from comment #30)
> I apologize for having brought you in this situation! In case this happens
> again you can boot with kernel boot option 'nomodeset'. With that you still
> have a desktop running (slow though) and can easily bring back the old
> firmware file and then reboot again regularly.

Everything is fine, I had created a snapshot before. I knew that something like
this could happen. thanks for the info as a alternative to it.
@takashi will try that out right away.