3GS 4.2.1 - 5.15.04 unlock with 6.15.00

[sabersurfer]

I have a 3GS 4.2.1 with baseband 5.15.04

I want to unlock it & currently there is only the "Upgrade to iPad 6.15.00 baseband" option available.
I know this will "BREAK" my GPS

I have already jailbroken it with Greenpois0n

How do i go about upgrading the baseband to 6.15.00?
Maintaining the FW 4.2.1

[RochOAR]

Use Redsn0w and check the box to upgrade to iPad baseband. Then install ultrasnow repo and run ultrasnow.

I used the directions in iclarified.com. The only thing that hung me up was on Windows 7 I had to change the affinity permission for redsn0w

[Goof]

Here is a link if that didn't work out for you

How to Update & Jailbreak iPhone 3GS / 3G Baseband to 06.15.00 with Redsn0w 0.9.6b5 for iOS 4.2.1 Unlock | Redmond Pie

[sabersurfer]

Thanks RochOAR I just unchecked install cydia and checked the upgrade to ipad baseband.
Then i installed ultrasn0w from cydia
worked perfectly.

[SweetGum]

Hi! I have the same 3gs 4.2.1 jailbreak with greenposi0n, can someone give me an advice when uncheck cydia and install ipad bb is the phone automatic reboot or i have to do something to reboot? Thanks

[i.Annie]

It will reboot for you

[SweetGum]

Thanks iAnnie

[i.Annie]

No problem