Sunday, September 25, 2011

DOWNGRADE HBOOT 0.92 Froyo 2.2 to HBOOT 0.80 Eclair 2.1 Step by step guide HBOOT Downgrade


How to downgrade your HTC Desire from HBOOT 0.92 Froyo 2.2 to HBOOT 0.80 Eclair 2.1

Requirements

1. Make a NEW Goldcard (here) depending on your device (branded or not)
2. Download PB99IMG.zip
3. Rename the downloaded file to PB99IMG.zip [NOT zip.zip !!!] and copy it to your SD Card.
4. Download this misc_update.zip to repair your misc partition in Step 3 and copy it to your SD card.
5. Download your desired ROM and copy it to your SD Card. Don't name it update.zip!

Step 1 - downgrade

1. Shutdown your device
2. Hold volume DOWN and press power button
3. Wait until PB99IMG.ZIP was found and verfied.
4. Press volume UP to start the update.
5. Wait until all steps are done. DON'T POWER OFF YOUR DEVICE!
6. After the downgrade progress has finished press volume UP to reboot.
7. done -> continue..

Step 2 - root with unrevoke recovery

1. Uninstall HTC Sync completely
2. Download unrevoke recovery here
3. Download the unrevoke recovery USB driver here and install them!
4. Enable USB debugging on your phone.
5. Start unrevoke and follow the instructions
6. If unrevoke has finished you should be in custom recovery.
7. Continue with the next step...

Step 3 - repair /misc partition

1. You are still in custom recovery mode
2. Select 'install zip from sdcard' (Use Vol + and - to navigate and trackball)
3. Select 'choose zip from sdcard'
4. Select 'misc_update.zip' from SD und confirm it with yes.
5. After that your /misc partition should be repaired
6. Go Back to custom Recovery menu.
7. Continue with the next step...

Step 4 - flash custom or stock ROM

1. You are still in custom recovery mode
2. Select 'install zip from sdcard' (Use Vol + and - to navigate and trackball)
3. Select 'choose zip from sdcard'
4. Select your desired ROM Zip-file from SD und confirm it with yes.
5. After the flashing progress has finished use the back key and then select reboot.
6. Congratulations. Now you have a re-rooted HTC Desire with HBOOT 0.80

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