2 
1 not restore iPhone stuck firmware error 50
iphone 4s restore process after 75% stuck and error code 50 show not -50 plz help
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You can try this...
Remove the SIM card, plug the phone into the computer, and performing the "Restore / Restore & Update" now without the SIM, which worked fine and then slipped the SIM back in the phone and started using it.
Sherri
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I would really like to know if this works
It will not work...
not working.....
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I could solve it, it was a problem on the logic board, I changed ic u18_rf. it works for me.
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really it work?
How do i do it please?
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If Flashing stops after 55% then it's baseband ic problems
Reball it @zakir gsm
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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
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it´s a problem with baseband, you can try change ic u18_rf.
Same for my iPhone 4S. WiFi upgrade to iOS9.3 from 9.2.1 failed/stalled. I then tried connecting to iTunes as the phone was stuck in recovery mode. It still failed about 2/3 of way through and left me with a phone that was not functional.
After 2 hours (over two days) with Apple Tech on Chat they booked my an appointment at the local Apple store. I was not happy as the phone worked perfectly until this upgrade!
Given error 29 is related to the battery or battery connection (by all accounts). The new battery (non Apple) which I installed 3 weeks ago and replaced with an original Apple battery. I also scrubbed the battery connector terminal on the motherboard with a soft toothbrush and rubbing alcohol.
I reconnected the phone to iTunes (old battery) and the upgrade was able to complete. I then replaced the old battery with the new non genuine one I had removed earlier and the phone is working fine.
I don't believe my new battery was faulty nor was there a hardware issue as such, but possibly the iOS9.3 is sensitive to non genuine parts in an old phone!
Good luck if you come across a similar problem as this may help you.
Admiral Adama
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This problem
Because (ic wifi) disconnect it
And restore your iphone that’s will be fix it .
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5 Comments
Could you solve it?
by Claudio Zelada
I have the same problem. :/
by Luis Palacios
I have the same problem,
I tried several times to pin it on itunes and on firmawer always stuck out and error 50.
by Lenka Stankovski
i have the same problem :'(
by Justine Chua
I have the same problem, I tried several times to pin it on itunes and on firmawer always stuck out and error 50.
by iulianpahomi