I had a Droid X with 621.
1. I installed via SBF - mb809-2.3.5.sbf and the radio from 621.
2. root via DooMLoRD_v4_ROOT
3. install Droid 2 bootstrup recovery and ROM Manager. In D2 bootstrup-> bootstrup recovery
In ROM Manager-> Flash-ClockworkMod 126.96.36.199
Then, in the D2 bootstrup-> reset recovery
4.The phone has been rebooted, and then there was a red moto logo. then the logo was gone, but the screen is turned on. pressing the PoWER /vol "+" and vol "-" give nothing. help only pull battery out