Hi, I have successfully downgraded my iPhone back to iOS 4.3.3. However, just few minutes after rebooting it, my iPhone got stuck in DFU mode and now its showing nothing other than a black screen. I tried to restore it again to stock firmware but no luck. Can anyone advise some tips and instruction to fix this error? Thanks in advance.
Asked by: Ronald from Paterson, New Jersey
And if you aren’t familiar with the steps, then you can follow the tutorial posted below:
Step 1: Download Zlib1.dll using this link and put it in the same location where fixrecovery43.exe is located.
Step 2: Connectyour iPhone 4 into the computer via USB cable and power OFF your device.
Step 3: Then launch TinyUmbrella (Fix Recovery) as well as iTunes and then put your iPhone into DFU mode.
- Hold down the Power and Home button at the same time for 10 seconds.
- Then release Power button after 10 seconds but continue holding the Home button for another 10 seconds.
Step 4: Once in DFU mode, TinyUmbrella (Fix Recovery) will start fixing the error. You should be able to use your iPhone after a minute or two.
On the other hand, after kicking your iPhone 4 out of recovery mode loop, you can now jailbreak your iPhone on iOS 4.3.3 using JailbreakMe 3.0. If you are planning to unlock it, then you can use Gevey SIM Pro.
