For those using N900 with Community SSU package you may have noticed that your N900 wants to update to some kind of unknown version ’21.2011.38-1′. What to do?
First of all the update is meant to update your certificates, removing the ones that were compromised, increasing security of your device (so you won’t end up installing software that was signed by invalid certificate). What if you’re using Community SSU and don’t want to brick your phone? There’s no simple answer to this question. I don’t have all of the answers, but let’s try to make it simple in this simple rules:
You don’t use CSSU. You can calmly update your N900, it shouldn’t brick after update.
You use CSSU stable. Well, this is longer story, according to developers you may meet some system issues after updating core system from Nokia having stable release of CSSU. The best way here is to wait for update of CSSU that will include all of security updates from Nokia.
You use CSSU testing. This is simple, at least it was for me. I wasn’t thinking much when upgrading, testing is testing, I was prepared to have some issues with new versions of software released by Nokia itself. Surprisingly it came with absolutely no glitches. Now I have this marvellous ’21.2011.38-1′ version and it goes smoothly.
One thing before I get to footer. Remember to make full backup before you try to update firmware of your N900. I mean it: FULL BACKUP! This way you won’t end up with piece of plastic and silicon dioxide that you can kill some cockroaches with. This way you can always re-flash and bring back backup files.