Default unbrick atrix rsd waiting for re-enumaration

how can i solve that this is what i did t the phone get brick SO I download the sbf and rsd 5.7
the phone is whit the unlock bootloader so i get this sbf

1FF-olympus-user-2.3.4-4.5.91-110625-release-keys-signed-ATT-US-GAS_NA_OLPSGBATTSPE_P011

1FF-olympus-user-2.3.6-4.5.141-111212-release-keys-signed-ATT-US-GAS_NA_OLPSGBATTSPE_P012

i flash it the 2.3.4 and the rsd lite said "Flash failure: Phone[0000]: Phone did not re-enumerate after RAM-downloader was sent."

and the phone dont reboot so i take the battery off go to fastboot and did this

fastboot erase system
fastboot erase user data *or just data if user data doesn't work for you*
fastboot erase boot *this is important*
fastboot erase cache
fastboot reboot

Then boot into RSD mode flash the SBF file again.

but nothing happen i did whit he two sbf 2.3.4 and 2.3.6 also i try to flash the 2.3.4 via fastboot but the system image said is too large and failed

any ideas?