Hi there!

I have CSSU installed and some old Nokia repos to have all packages available (muaf).

I have run apt-get upgrade and found 50 MBs of updates. The phone have done the upgrade and now it is not booting up at all. After seeing the Nokia screen it becomes dark and nothing happens.

Did I crash it?
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EDIT:
I could reflash the phone somehow... So or now we are good to go.
BUT please check this!!!

A simple apt-get upgrade should not jeopardize the full OS and prevent it from booting. At least no one was saying "don't do update like on an average Debian based Linux system".