firmware w/bb 06.15.00

[jamos316]

i recently upgraded my iphone 3g to firmware 4.2 and jailbroke it with redsn0w. i selected the upgrade to ipads baseband during install so i could then unlock it.
it was working perfectly until yesterday when i turned on my iphone it just froze and didnt do anything. i tried everything but it just wont function.
so i need to do a restore but i need one that will allow the 06.15.00 baseband as i believe you can't downgrade from this baseband.
any suggestions people?

[Simon]

Check here: [How To] Fix 1015 error after updating to iPad baseband and trying to restore

[jamos316]

Check here: [How To] Fix 1015 error after updating to iPad baseband and trying to restore

thanks for response. i installed 3.1.3 firmware. just tried to install it and hit a 1600 error. i entered dfu mode then in itunes pointed to the 3.1.3 firmware to restore.
i also tried putting my phone in dfu mode, starting up ireb. hitting iphone 3g where i would then see a white screen followed by a green screen. i then went back into itunes and restored. i encountered a 21 error then.

what shall i do?

[Simon]

You tried a regular 3.1.3 firmware?

[jamos316]

You tried a regular 3.1.3 firmware?

but that wont work i have already upgrade baseband to 06.15.00

[Simon]

It doesnt matter. Just downgrade to 3.1.3 regular. You will get a 1015 error, just use tiny umbrella to kick out of recovery then you can go about activating with a official sim or jailbreaking and hacktivating with redsn0w 0.9.4.

[jamos316]

great, it seems to be installing fine at the moment, will let you know when it has successfully finished then will thanks you.

just one more question, is there no way i can restore back to the 4.2 firmware? if not what about when the new 4.3 comes out

[Simon]

You can go back to 4.2.1 with a custom firmware if you want

[jamos316]

3.1.3 went on perfectly thanks very much

tried to install 4.2.1 custom firmware but came up with a 1600 error straight after extracting.

when 4.3 comes out, will i be able to upgrade to the stock ipsw

[Simon]

You need to run redsn0w or pwnage tool and get either of them to put the phone into pwned dfu before you can restore to a custom firmware.

[weinerd]

question jamos- what baseband are you on with 3.1.3? Is it still at 06.15.00?

[jamos316]

question jamos- what baseband are you on with 3.1.3? Is it still at 06.15.00?

yes, still at 06.15

[iYeow]

3.1.3 went on perfectly thanks very much

tried to install 4.2.1 custom firmware but came up with a 1600 error straight after extracting.

when 4.3 comes out, will i be able to upgrade to the stock ipsw

Your iphone will not be able to restore to stock 4.2.1 or higher anymore.
For future upgrades, you will have to restore to only custom fw.

[BenderRodriguez]

Your iphone will not be able to restore to stock 4.2.1 or higher anymore.
For future upgrades, you will have to restore to only custom fw.

Unless Apples next 4.3 update has baseband 6.16 to stop the current exploit then you will

[Simon]

Ya we will have to see how they handle this.