Downgrade iPhone3GS 6.15 baseband using redsn0w tutorial Guide to downgrade iPhone3G 6.15 baseband to 5.13.04 using redsn0w Redsn0w baseband downgrade guide Downgrading iPhone baseband...
The iPhone Dev-Team as promised has released an updated version of redsn0w that will allow iPhone3GS and iPhone3G users to downgrade their device's iPad baseband 6.15 which was performed in order to unlock the devices. This however casued certain unexpected issues like battery drainage and loss of GPS in iPhone3GS. It was mandatory to flash iPad's 6.15 baseband on iPhone3G and 3GS as that was the only unlockable baseband that could be unlocked using iPhone Dev-Team's Ultrasn0w unlock. Musclenerd made an announcement earlier that a tool will be released in future that would allow the possibility ofdowngrading iPhone3GS and 3G basebands to an unlock-able version.
Having said that, today the iPhone Dev-Team proudly announced the release of updated Redsn0w that allows the users to downgrade their basebands. Since playing with basebands is not cool, we decided to prepare an easy to follow instructions guide to downgrade 6.15 baseband.
Step 1 : Download the latest version of Redsn0w and the current firmware of your device
Step 2 : Extract the contents of the Redsn0w archive that you just downloaded.
Step 3 : Connect your iPhone3GS or 3G and Launch Redsn0w.
(Windows7 users should select the option of running as administrator by right clicking on redsn0w application and then selecting the option - Run as administrator)
Step 4 : In the redsn0w, go to extras menu