How to downgrade baseband 6.15.00 on iPhone 3G 3GS?

How to downgrade baseband 6.15.00 on iPhone 3G 3GS?

For those who are reading this for the first time, downgrading to a lower baseband will allow iPhone 3GS/ 3G users to unlock their device with ultrasn0w 1.2.7. It will also enable the device's GPS capabilities. Before you begin, read this warning from the iPhone Dev Team: If you have an iPhone3GS and if digits 3-5 of its Serial Number are 134 or later (xx134.), then you should NOT try to install the 06.15 baseband on your 3GS! It will brick your radio, preventing both the downgrade from working and normal iPhone software from using it as a phone! Be warned! Pre-requisites

Backup all the important data on your phone.
The battery should be charged at least 80%.
This tutorial is meant only for iPhone 3/3GS with baseband 06.15.00.

Go this way Unlocking and information

  • Updating baseband on iphone 3gs? I jailbroke my phone, and everything worked fine, now i'm trying to update the baseband so I can unlock the sim. Does anyone have a good site or know how to update the baseband? I'm at 05.16.05 right now and I need to be at 06.15.00.
  • MY IPHONE 3GS STUCK AND BRICK IN BLACK SCREEN AFTER TRYING DOWNGRADE? I tried to downgrade my 3GS from 6.1.6 to IOS 4.1 i have the shsh blobs and i tried to do it with ifaaith i did the steps but after i did it on the itunes i got that error and now my iphone is stuck on black screen i tried to restore the ios 6 and ios 4 from itunes but it didn't work please help!
  • Iphone 3gs has no Wi-Fi no bluetooth no baseband? I tried using snow breeze to make a custom firmware on my iphone 3gs and tried installing the ipad base band, now it turns off and on sometimes, and the weird thing is this iphone has a old bootrom it was made in 2009.i've done many jailbreaks on iphone 3gs made before 2011 and all done successfully but this one has been a nightmare, how can i restore this back to stock, iTunes always gives an error -1.
  • Iphone 3gs flash ipad baseband 6.15 then downgrade possible on newer serial #? I'm not entirely sure if this will work as some say it'll brick, while few others have claimed it'll work. Can anyone verify or confirm this for sure? Basically will these methods work? Iphone 3GS with newer serial # manufactured "after" 134 (2011, week 34). 1) Flash ipad baseband 6.15 2) Then downgrade baseband using cydia to baseband 5.13 3) If above step doesn't work, downgrade to custom firmware 4.1, then use cydia to downgrade baseband to 5.13.

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