iPhone 3G - Stuck on 3.1.2 with BB 6.15.00 - Need Help

[ndillon]

I am getting ready to sell my wifes iPhone 3G and want it to be unlocked and jailbroken before doing so.

I previously had jailbroken it with Greenpoison and had it on 4.2.1 with the 6.15.00 BB and unlocked. Then like an idiot I read that doing a "Erase All Content And Settings" was a good idea. This caused the phone to then go into brick mode. Only way I could get it back was to use a 3.1.2 FW and restore.

I am looking to get this thing up to 4.2.1. Jailbroken and Unlocked.

Here is where I currently stand.

Version: 3.1.2 (7D11)
Carrier: AT&T 5.5
Baseband 06.15.00

Where do I go from here? The phone is currently jailbroken and unlocked but Cydia has many errors and I dont feel comfortable selling it as is.

[Simon]

You need to make a custom 4.2.1 with pwnage tool or snowbreeze then and restore to that.

[ndillon]

Sorry it took me so long to respond. Anyways, that worked like a charm. Thank you very much.

[Simon]

no prob

[udg21]

thanks worked for me too