This is a discussion on Huge problam with baseband 06.15.00 within the iPhone Jailbreaking forums, part of the iPhone Hacking & Jailbreaking category; I have an iphone3G. I did the mistake to connect it to itunes and update to latest software 4.2.1 so it locked and it does ...
I have an iphone3G. I did the mistake to connect it to itunes and update to latest software 4.2.1 so it locked and it does not accept my SIM card. So I upgraded baseband to ipads 06.15.00 with redsnow and activated, jailbraked it and unlock it with ultrasnow. Everything was perfect BUT then i did the most stupid thing.
I connected it again to itunes hoping to load my photos from a backup. But things didnt work in a good way. It locked again. I dont know the current firmware that it has.
Now i cant jailbreak it with redsnow and itunes wont restore to any IPSW because itunes cant downgrade the baseband. The phone is not even activated right now and i cant run cydia to unlock it.