How to Resolve iPhone 4S Error 21
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How to Resolve iPhone 4S Error 21
The 2 errors I’m getting are iPhone Error 4S Error 21 and iPhone Error 4S Error 1600. If I fix one error, it just jumps to the other. Any help would be appreciated, just got this thing not too long ago.
It is most likely that you would have configure the software to allow
the following domains to send and receive data from the Internet for
some special purpose (like downloading a newer OS upgrade when all Apple
servers are heavily burdened).
How to Resolve iPhone 4S Error 21
You can easily fix the iPhone Errore 21 or iPhone 4S error 1600 aby
temporarily blocking Apple’s firmware signing services. Error 21 or
Error 1600 are usually triggered when an unsigned firmware is used,
often during an iOS downgrade or even during some restores.Follow the
following easy steps to resolve iPhone error 21.
- Quit iTunes
- Locate your hosts file. If you’re using Mac OS X, it’s in /etc/hosts and if you’re using Windows, it’s in C:\windows\system32\drivers\etc\hosts
- Open the hosts file with Administrator privileges
- Comment whichever of the following lines are present in the hosts file:
74.208.105.171 or gs.apple.com and
74.208.10.249 gs.apple.com
- Connect your iPhone or iPod or iPad to the same computer
- Launch iTunes
- Put the iPhone/iPad/iPod into DFU mode by turning the phone off and then holding down the sleep and power button for 10 seconds, then release the power button but hold onto the home button until iTunes tells you that the device is now in recover mode
- Use the iTunes Restore feature as usual with the iOS device