I have tried repairing a k750i, After unlocking the handset wouldnt boot, tried setool and got this log:

Open COM port OK
ChipID:8040,EMP protocol:0301
PHONE IS INVISIBLE (FFFFFFFF)
NO VALID FLASH CID DETECTED (463)
skipping empty loader...
Can't load id loader !
Elapsed:8 secs.

Any ideas?