Googe NexusOne : Downgrading from Froyo FRF91 to have it rooted

Posted on July 13, 2010

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For those users whose NexusOne is still on stock rom ( unrooted ) , the recent OTA updates would have updated it to ver 2.2 Froyo FRF91. You might want to try some of the custom roms but to do it you’d need to root your phone.

The problem here is FRF91 does not allow you to flash/downgrade to a earlier rom. Credit and thanks to  Juan413 of XDA who had given us a solution :

1. Download the file passimg.zip here

2. Copy this file to the root of your SD card

3. Switch off the phone

4. Hold down the Volume Down button as you power your phone back on.

5. A screen should appear showing your phone’s system searching for various files. This will take up to 2 minutes.

6. The phone will ask you if you want to start the update. Press the Volume Up button to start the update.

7. If you followed these steps correctly, Congratulations, you are now on stock EPE76 Android 2.1 and able to flash to any official Nexus One rom that has been released.