Saturday, August 7, 2021

iPhone could not be updated

A while back my iPhone failed its update. I was too busy to look into it then.

Just now, I tried again, (updating via iTunes while connected to PC).

Error:
iPhone could not be updated
an unknown error occurred 
(4000)

https://support.apple.com/en-us/HT201210
update windows
 done
  windows 10 home 10.0.19043
update itunes
 12.11.3 
  is the current version
try a different usb cable
 done
reboot both hardware
 done

https://support.apple.com/en-us/HT201413
 security software
  seems unrelated

https://support.apple.com/en-us/HT204770
 follow the steps for your error code
  nothing relevant

Try again (updating via iTunes while connected to PC).
- says "extracting software" (with progress bar) successful
- says "backing up iphone" (with progress bar) successful
- says "preparing iphone for software update" (fails before progress bar starts)

I also removed lint from the usb port.
Tried again.
Same failure.

The existing ios version is 14.6 (18F72)
I'm attempting to install ios 14.7.1

I tried updating from the iphone only (no iTunes) (plugged into power)
- says "about 2 minutes remaining"
- says "preparing update"
- says "downloaded"
- click "install now"
- says "verifying update"
- soon after says "unable to install update, an error occurred installing ios 14.7.1"
- click "retry"
- enter pin (it didn't prompt for that the first time)
- says "verifying update"
- screen went black (that's new)
- shows apple logo with progress bar (looking good)
- progress bar advances but doesn't get to the end
- screen went black again
- shows apple logo with progress bar (again)
- progress bar advances 

Success!
Your iPhone has been updated.

ios
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