iPhone Baseband

How do I downgrade my iPhone 3.1 baseband to 04.26.08?

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.

How can I downgrade my iPhone 3G baseband to 02.28.00?

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.


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