iphone baseband

The Dev-Team could be working on an unlock for iPhone users who have already updated to official firmware 3.1.3 and find themselves stuck with no unlock options at the moment. Sherif Hashim has discovered an exploit that could be used to unlock the current iPhone baseband so the iPhone can be used with carriers other than AT&T.

This exploit was verified by Dev-Team's own MuscleNerd as a legitimate and working exploit. It's possible the Dev-Team would wait until the release of iPhone OS 4.0 on the next generation iPhone before revealing the exploit to Apple with a new unlock, however the new iPhone isn't expected to ship until later this summer.

George Hotz (Geohot) has released the newest update of his jailbreaking tool blackra1n, version RC3. In addition, he has made public a true carrier unlock for the latest firmware iPhone OS 3.1.2 and baseband 05.11.07.

Geohot's blackra1n RC3 software jailbreaks any iPhone running 3.1 or later in seconds on both Mac and Windows platforms. A reboot is all that's needed.

Updating to iPhone firmware 3.1 using iTunes will also update your baseband from 04.26.08 to 05.11.07. To unlock your iPhone for use on a different GSM carrier with ultrasn0w this modem firmware must be downgraded to the older version.

Unfortunately, downgrading the baseband using the tools below requires a jailbroken iPhone 3G. The solution will not work on an iPhone 3GS or an original iPhone.

If you've used Apple's iTunes update process to update your iPhone 3G to OS 2.2.1, you may have noticed the baseband was also updated from 02.28.00 to 02.30.03. Unlocking a jailbroken iPhone with yellowsn0w to use it on additional wireless carriers requires baseband version 02.28.00.

The solution is now available on Cydia: 3G Fuzzyband Downgrader. This software will safely downgrade any newer baseband to 02.28.00.