If your friend has a legitimate 451S, flashing to the official FW shouldn't cause the orange flashing light. Are you sure that the drive is a legitimate real 451S (not 411S?). Is there anything else that was done that was not mentioned?
Yes, there is a way to fix this. But it would be nice to nail down what the cause is, as this is not supposed to happen... Anyway...
1) Get the EEPROM Check Remover from here: http://codeguys.rpc1.org/patchers.html
2) Use it to patch GSB7.exe (make sure it's not read-only)