3GS restore - regular case?
I have a 3GS 32gb with fw 3.0, baseband 4.26.08, with jailbreak.
I don't know which jb method was used, and I don't know if it was factory unlocked, or unlocked by software.
I need to upgrade to 3.1.2 or 3.1.3 and I am using iTunes 18.104.22.168.
In this case, where I don't know what jb was used, can I close my eyes and run blackra1n RC3? Is it the best option or should I restore with a custom ipsw?
If blackra1n is the best choice, which ipsw should I use? I'm afraid of upgrading the baseband to 05.12.01 and not being able to unlock it later.