I have the a853 milestone with CM7
Build number - R.U.R.1920
Android version 2.3.4
And each time i press Reboot phone to Recovery, the phone restarts show's the 'M' then show's the "!" sign for 1 second and immediately restarts. I have tried to install other recoveries to the phone by using the RSD Lite v4.6 [vulnerable_recovery_only_RAMDLD90_78.sbf,BL_9078_u mts_sholes_HS_Consumer_replacer.sbf].After installing this the RSD was showing that's the process is complete but nothing happens and the phone keeps restarting at the recovery like it never have been installed.