Jailbreak and unlock iPhone 3G 3Gs with iOS 4.2.1

Information available method to unlock depending on the version of modem firmware / baseband

iPhone 3G/3GS:
3.0 : Modem FW 04.26.08 - with Ultrasn0w
3.0.1 : Modem FW 04.26.08 - with Ultrasn0w
3.1 : Modem FW 05.11.07 - with blacksn0w или with Ultrasn0w
3.1.2 : Modem FW 05.11.07 - with blacksn0w или withUltrasn0w
3.1.3 : Modem FW 05.11.07 - with blacksn0w RC2 orwith Ultrasn0w
3.1.3 : Modem FW 05.12.01 - with Ultrasn0w
4.0 : Modem FW 05.13.04 - with Ultrasn0w
4.0.1 : Modem FW 05.13.04 - with Ultrasn0w
4.0.2 : Modem FW 05.13.04 - with Ultrasn0w
4.1 : Modem FW 05.14.02 - with BB 06.15.00 update redn0w 0.9.6b5 + ultrasn0w 1.2
4.2 : Modem FW 05.15.04 - with BB 06.15.00 update redn0w 0.9.6b5 + ultrasn0w 1.2

iPhone 4:
4.0 : Modem FW 01.59.00 - with Ultrasn0w
4.0.1 : Modem FW 01.59.00 - with Ultrasn0w
4.0.2 : Modem FW 01.59.00 - with Ultrasn0w
4.1 : Modem FW 02.10.04 - not unlock now.
4.2 : Modem FW 03.10.01 - not unlock now.

I want to explain why this guide is updated baseband.

Baseband is updated only with a newer version. Who is or put on 05:14:02 05:15:04 can not download them back to the version that has a lock can only updates with a new numbering. These two versions can not be unlocked yet. Version 6.15.2000 is taken from the iPad (iOS 3.2.2) which is the same chip as the iPhone 3G/3GS, and this makes baseband compatible. Flash on iPhone 3G/3GS of 6:15:00 is imperative because it is newer than the two that you mentioned as numbers, but also 06:15:00 is as old as time and contains the same exploit as the older versions are unlock by Ultrasn0w. One kind of method to unlock is by update with baseband containing exploit which makes unlocking possible.

Each version of the modem 04:26:08, 05:11:07, 05:12:01 and 05:13:04 not to follow this guide or to omit parts of baseband update! These versions of the modem is unlocked directly by ultrasn0w.

Once you upload the baseband-a to this version (6:15:00), no return!
What this means:
- No way to hide the version of the baseband-a. Therefore lose any guarantee to your phone.
Those with 3GS the new iBoot, to his thinking.

Once 1.step

Then let redsn0w:
-For iPhone 3G/3Gs specify which firmware you restore / jalbreak, 4.1 or 4.2.1.




2.step

After selecting the firmware for iPhone 3Gs, will ask you if you are new or old bootrom, it is very important to know!



3.step

Then press Next.If you have made jailbreak on your phone, here select "Install Cydia" and "Install IPAD baseband" and select YES-to baseband to frequently updated 06:15:00.
Then Next.



Note:
And if you have already made JailBreak on your phone, just select "Install iPad Baseband" and "Next"




4.Step

Here you turn off your phone and get ready to insert it into DFU mode.

Pre-flash the baseband is very specific and in no case to stop this process!


Note:
Holders of iPhone 3GS (new bootrom), who have done a Jailbreak iOS4.2.1, should always be placed redsn0w after restart the device and marked "Just Boot Tethered Right Now" as described in 3.step.above, will freeze the apple!