: This means that the modem firmware could not be updated.
There are times when things may go wrong with the phone or touch and you may need to restore the device to factory settings and start over.
“What is i Tunes or i Phone error 21 and how to fix it quickly?
I got this when I tried to connect my i Phone 7 to i Tunes and update to i OS 11, which says “ The i Phone could not be restore.
by Abby July 18, 2017 | NO COMMENT Get confused when you met the i Tunes error 21 when you update your i Phone, i Pad or i Pod touch 6 to i OS 11?
Now we’ll show you how did this happen and how to cope with it easily.