Er zullen ongetwijfeld mensen zijn die per ongeluk hun iPhone naar firmware 2.0 geüpdate hebben. Misschien wel expres om te experimenteren, maar zonder goede software om hem te kraken, kom je natuurlijk nergens.

Zowel Hackint0sh als BigBoss hebben een handleiding uitgebracht om te kunnen downgraden, inclusief de baseband om gewoon weer te kunnen bellen.

Hieronder vindt je de handleidingen, letterlijk als hoe ze uitgebracht zijn.


  • You MUST have an earlier version of iTunes than 7.7 to do this – I used version 7.6.2 (the one before 7.7).
  • Put the iPhone i DFU mode and restore to 1.1.4. iTunes say error 1015 of course as iTunes can’t downgrade the baseband.
  • iBrickr couldn’t kick iPhone out of restore mode, so I restored to firmware 1.1.4 one more time, THIS time with regular restore mode. Once again error 1015 in iTunes.
  • NOW iBrickr was able to kick iPhone out of restore mode.
  • Then I used “ZiPhoneGUI – patched by kIREmK” to downgrade the baseband.
  • Restored (regular restore this time) to 1.1.4 again (using iTunes 7.6.2).
  • Used iBrickr to kick iPhone out of restore mode.
  • Then using PwnageTool 1.1 to put my own custom firmware 1.1.4 on the iPhone.

Handleiding BigBoss:

1) The first problem in your downgrade is that you probably are getting error 20 in restore mode and error 160x in DFU mode. This is due to iTunes 7.7.  So, you now you need to uninstall iTunes 7.7 and install iTunes 7.5. Make sure after your iTunes 7.7 uninstall you reboot your pc as it requests you to. **OSX users, see note at bottom of page to downgrade your iTunes.2) Now that you have  iTunes 7.5, you will still have the DFU driver for 7.7. This is good and will allow the process to work. Put your phone into DFU mode using the DFU steps.

3) Restore using iTunes 7.5. You will get an error like 1011, 1013, 1015. This is normal and expected. An error 1601, 1602, 1600 or anything else is not ok.

4) Once you get error above, leave iTunes open and kick your phone out of restore mode. I recommend just loading winpwn(PC) or pwnage(MAC) and pwning the device at this point. If pwnage fails to work, you need to restore your phone again. You should be able to use normal restore mode, however. Other ways to kick out of restore mode may be ibrickr, jailbreak 1.1.2 (boot phone), iLiberty+.

5) Once completed, you have a pwned device with baseband 4.05.04_G from firmware v2.0.

6) To get back to 04.04.05_G (1.1.4 baseband) load bootneuter. If you don’t have this, install it from installer. Run bootneuter with Neuter, 4.6, and unlock. When it’s done, you will have an unlocked 04.04.05_G right back where you started.

Note: if you get  a boot neuter error like 05, 02 or such, you probably have more steps. Unfortunately, there is no safe answer to this one.The only method I know of to do this is to use a patched version of Ziphone as described here. Before you do this, you should know the risks. Read my Ziphone warning here. Your other option is to just wait for dev teams pwnage v2.0.

Note for OSX users:
If you are on OSX and want to attempt to downgrade your iTunes, you can try these steps:

Load up Terminal and type the following:
killall iTunesHelper
sudo -s
rm -r /Applications/
rm -r /Library/Receipts/iTunesX.pkg
rm  ~/Library/Preferences/*
rm -r /Applications/
rm -r /Library/Receipts/iTunesX.pkg
rm  ~/Library/Preferences/*
rm -r /System/Library/PrivateFrameworks/MobileDevice.framework

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