not restore iPhone stuck firmware error 50

I could solve it, it was a problem on the logic board, I changed ic u18_rf. it works for me.

"If Flashing stops after 55% then it's baseband ic problems

Reball it @zakir gsm"

may iphone 4s error 50

I changed the lcd of IP 4s after that without sim also searching only . . I connect to iTunes still the same , after that I restored the firmware to latest one now it's stucked on 75% , error code 50 pls help me

not working at all try baseband ic