Hello Jaxov peeps, I restored my iPhone 4 to iOS 4.3.5 last week to get a fix from Apple. So after two days, I got my iPhone back and then tried to downgrade it back to iOS 4.3.3 using TinyUmbrella and my saved SHSH blobs. But when I tried to downgrade my iPhone 4 using iTunes, I got the message "Error 1015". This is my first time to downgrade an iOS device. Please help. Thanks.
Asked by: Jefferson from Texas City, Texas
Step 2: Download Zlib1.dll from here and put it in the same location where fixrecovery43.exe is located.
Step 3: Then connect your iPhone 4 into the computer via USB cable and power OFF your device.
Step 4: Now, launch iTunes as well as the downloaded TinyUmbrella (Fix Recovery) and put your iPhone into DFU mode.
- Press and hold the Power and Home button for 10 seconds.
- Then release Power button after 10 seconds but continue holding the Home button for another 10 seconds.
Step 5: That’s it! TinyUmbrella (Fix Recovery) will start fixing the error on your device.
Anyway, you can also follow our step by step guide on how to downgrade iPhone firmware using TinyUmbrella which can be found on this blog post, as well as our tutorial on how to jailbreak iPhone 4 on iOS 4.3.3 using JailbreakMe 3.0 that was posted here.