How do i downgrade a 1.1.2 phone.
Downgrade the main firmware:1.Connect the phone to the computer and launch iTunes.2.Restore your phone like explained in details here.3.You will get an error when restore is complete, just ignore it and run AppTapInstaller.exe (to Mac users: iNdependence should do the same.4.AppTapInstaller.exe will fail, but your phone will get to the Activation Screen now!5.When on the activation screen, just follow my tutorial to jailbreak and bypass activationNow your phone main firmware is ok, but to get the phone part working properly you should also downgrade your baseband firmware. At the moment this is NOT possible if your phone already had 1.1.2 when you bought it (meaning it has the new bootloader). If you accidentally upgraded your phone to 1.1.2 and want to go back to 1.0.2 or 1.1.1, read on.
Downgrade the baseband firmware:1.Make sure Modem version is 04.02.13_G in Settings ? General ? About.2.Set Settings ? General ? Auto Lock ? Never.3.Start Installer and install BSD SubSystem found in System Category.4.Go to Sources and tap edit and add http://i.unlock.no/5.Now install “BB Downgrader (1.1.2)” found in Unlocking Tools category. This will take around 5 minutes.6.When done, restore your phone to get 1.1.1 firmware reinstalled.7.When phone have been restored, you can Activate and unlock as normal.Can’t find AnySIM – Unlocking Tools category is missing















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