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Nate True's Weblog: Posts tagged with downgrade
Posted by natetrue 38 weeks agoJust a small update - if you want to downgrade your iPhone from 1.1.1 back to 1.0.2, iBrickr will guide you through it. No button holding either, it's easy!
Check it out!
Posted by natetrue 39 weeks agoAlright! Congrats to Kmac1985 from the Hackint0sh forums who discovered this little doozy of a method. Make sure to read the issues below (it's not COMPLETELY reversible). On a phone that has 1.1.1 installed:
- Start by downloading the 1.0.2 firmware here. Get it while it's still hot. That's an Apple download link so it's subject to change.
- Try to sit under a good light source. You need to see the screen clearly when it's not backlit.
- Make sure the phone is on and running normally (if activated, at the Home screen, if not, just at the "Activate iphone" screen). The phone must also be docked or plugged in to your USB cable.
- Press and hold the Power and Home buttons on the phone until the screen shuts off.
- Release the Power button immediately. Keep pressing the Home button.
- You should see a number of horizontal lines invade the now-off screen, and it will be slightly disturbing. If you just see just flat blackness turn your phone back on and try again.
- Your computer will recognize an "Apple Restore (DFU) Device". Open iTunes and it will complain about needing to restore.
- Hold Shift if on Windows, or Option/Alt if on Mac, and click Restore in iTunes. Select the 1.0.2 firmware file you downloaded.
- Let it restore. It will error out but the phone will have been upgraded.
- Restart your phone with the power + home buttons and you have a 1.0.2 phone again! Activate and use according to your preference.
Issues with this method
On my phone the phone won't boot unless I directly issue an "fsboot" command to the bootloader. I don't think this happens to everyone, and it's fixable with a few tweaks to NVRAM (details to come).
Also my phone was unlocked (needle method) and so the radio is corrupt, giving me the "Mismatched IMEI" state that I don't understand very well. Apparently non-unlocked phones suffer this issue after downgrading as well.
If your iPhone just boots to "Please connect to iTunes" all the time
This is an issue that I had. What you need to do depends on your operating system.
Windows:
- Download iBrickr and extract it somewhere.
- Open a command line and cd to the folder you extracted iBrickr to.
- Run iphoneinterface from the command line.
- You should see an r_recovery prompt.
- Type "setenv auto-boot true" and hit enter.
- Type "saveenv" and hit enter.
- Type "fsboot" and hit enter.
- Your phone will boot properly.
Mac:
- Download iPHUC and run it.
- You should get a recovery mode prompt.
- Type "cmd setenv auto-boot true" and hit enter.
- Type "cmd saveenv" and hit enter.
- Type "cmd fsboot" and hit enter.
- Your phone will boot properly.
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