Tristan Active Member Thread Starter Joined Feb 4, 2012 Messages 147 Reaction score 49 Jun 28, 2013 #1 Does any one know what error21 is, and what I need to do to fix it?
willerz2 Super Moderator Staff member Joined Aug 15, 2012 Messages 7,644 Reaction score 652 Location New York Jun 28, 2013 #2 Error 21 often times is an IPSW and/or DFU issue, particularly if you're attempting to restore to a custom IPSW.
Error 21 often times is an IPSW and/or DFU issue, particularly if you're attempting to restore to a custom IPSW.
