Posts Tagged ‘unknown error 21’

Easy to Fix iTunes error 21 in Mac

4 / 5 ( 1 vote ) iTunes error 21 can be seen when a user tries to update or restore his/her iPhone, iPad, or iPod Touch in iTunes. When the error occurs, the error message says – “The iPhone [Device name] could not be restored. An unknown error occurred [error number]”. Many of the […]