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http://www.petrmara.com/blogger/2007/11/jak-hacknout-iphone-111-bez-pouit-potae.html
How do i downgrade a 1.1.2 phone.
At the moment this is NOT possible if your phone already had 1.1.2 when you bought it. 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.
You will need to downgrade both the main firmware and the baseband firmware:
Downgrade the main firmware:
Connect the phone to the computer and launch iTunes.
Restore your phone like explained in details here.
You will get an error when restore is complete, just ignore it and run AppTapInstaller.exe (to Mac users: Not tested by me, but iNdependence should do the same. Please give me feedback on that: unlock æ unlock.no).
AppTapInstaller.exe will fail, but your phone will get to the Activation Screen now!
When on the activation screen, just follow my tutorial to jailbreak and bypass activation
Now your phone main firmware is ok, but you should also downgrade your baseband firmware.
Downgrade the baseband firmware:
Make sure Modem version is 04.02.13_G in Settings → General → About.
Set Settings → General → Auto Lock → Never
Start Installer and install BSD SubSystem found in System Category.
Go to Sources and tap edit and add http://i.unlock.no/
Now install "BB Downgrader (1.1.2)" found in Unlocking Tools category. This will take around 5 minutes.
When done, restore your phone to get 1.1.1 firmware reinstalled.
When phone have been restored, you can Activate and unlock as normal.
flatliners píše:jak vidim každej iphone se chová při upgradu jinak,je to holt telefon s vlastní duší
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