I have a factory unlocked 3GS with the new bootrom.
It was running fine for about a month until i decided I need to jailbreak it (to install callerID Fix). I used blackra1n and it worked fine. I did not have to use any unlocks as this was already activated and working.
I am now running on a tethered boot and it is fine with me, what is not fine, is that every day or so, the phone gives a black screen and I cannot do anything untill i Enter DFU mode and turn it off then back on then I would need to connect to a PC to boot it!
It is not a 3.1.2 issue as I had it for a month without any problem...
but why would it suddenly give a black screen? and it is happening at random intervals! I am thinking to restore the phone without any kind of jailbreak until a more reliable one is out!
But before I do that I wanted to know if anybody faced similar issues.