Jailbreakers are now able to downgrade their iPhone 3G/3GS baseband from 06.15.00 to any earlier baseband like 05.13.04. This is thanks to the new Redsn0w Version 0.9.14b1, according to JBU.
Thanks to the “amazing efforts” of MuscleNerd, jailbreakers on older iDevices can now downgrade to their baseband. In the process, these users can now have the best of both worlds: Have ultrasn0w compatibility and a normal iPhone baseband with full GPS and the ability to use stock IPSWs again.
Here are the necessary links:
Download redsn0w 0.9.14b1 (OS X)
Download redsn0w 0.9.14b1 (Windows — run in Administrator Mode)
Note: Be sure to check out JBU’s page for a full step-by-step guide to downgrade.
Source and Photo: JBU