Ive done this now, copied the gdfs from another k610i so i got the GDFS backup and and flashed/wrote it to the "dead" k610i.
The GDFS is unique to every phone, so you shoudn't flash your phone with another GDFS. You should have saved your own GDFS before messing up with your firmware. You should follow Khaba's advice and go to a service centre to see if it can be repaired.