3gs won't start after BB 6.15

[befi]

Hello gyes, thanks for your help but I couldnt manage to fix it
I have tried what you suggested me to do but nothing happened
First I think that now I cannot restore it with 4.1 fw cause I have already upgraded to 4.2.1 ( I`ve tried, it says not compatible) After upgrading I`ve tried jailbreak with redsnow 0.9.6b5 adding iphone 4.2.1 ipsw and ipad 1.3.2 ipsw and I ended with my Iphone on restore mode ( on the screen it shows to connect with itunes). I have tried to restore it again with itunes but at the end it says error and nothing happens.
After reading your advices I downloaded tinyumbrella-4.21.01 tried to exit recover mode and still nothing happens,it keeps restarting with itune logo!!!!

am I doing something wrong or what else can I do?
Please help, thanks in advance

[tjibarra]

Re-jailbreak your phone with redsn0w 0.9.6b4, take note its beta 4! Point it to 4.2.1 ipsw and select install cydia when prompted, if it still does not work, try pointing it to 4.1 ipsw using beta 4. It should revert back to 4.1 while maintaining the 6.15 baseband

[XFXOnline]

Befi, I had the same problem. Once you have baseband 6.15 installed you should be able to restore to original iOS 4.1 firmware using iTunes. It may still give you an error once it finishes but that's ok. Jailbreak it with redsn0w 0.9.6b5 and point it to the 4.2.1 ipsw. Select install cydia and let it do it's thing. Once that's done if it won't boot use tiny umbrella to kick it out of recovery mode and it should load up. From there I just unlocked with ultrasn0w 1.2 in cydia and that was it. Untethered jailbreak and unlocked.

Thanks Man you saved my iPhone 3gs and by the way it's untethered now, how I could not tell
you managed to put an end to my three days research on the internet now I could go back to sleep, if any one need help just ask
Thanks again you are the one

Thanks Man you saved my iPhone 3gs and by the way it's untethered now, how I could not tell
you managed to put an end to my three days research on the internet now I could go back to sleep, if any one need help just ask
Thanks again you are the one

[zahi_k]

Hello, I tried the steps above with no luck..... tried to restore to 4.1 and i ended up with error 3094;

tried the steps above with luck.. am always stuck on connect to itunes...

any help??