I was trying to upgrade from Android 2.1 to 2.2 with the following guide Droid Den - Phone Guide: How To Install Rooted Android 2.2 On Your HTC Desire - Droid Den Once the phone was done flashing DeFrost, with ROM manager, I restarted it. However, the phone will not boot. When powered on, all I can see if the green HTC logo against a white background. What do i do now? Update: I managed to got past the HTC Logo screen where it would show a Red/Green/Yellow/Blue X and then boot into Android 2.2. I did this by clearing the storage data in the bootloader and restarting. I would have no phone reception and is unable to get wifi connection. and would get an error message saying Process system is not responding at start up. Further, the phone keeps restarting by itself. Also, SD card not detected and i would get horizontal line noise on the screen.