CANT RESTORE IPHONE ERROR 21 wrote:
hi. When i try to restore my iPhone, it says "Cannot restore unknown error 21"
HELP!!!!
Have you tried restoring the iphone in DFU Mode?
Try this
Step 1. Turn off your iPhone.
Step 2. Hold down the power and home button.
Step 3. When you see the Apple logo, release the power button but continue holding the home button down.
Step 4. Open iTunes and wait for it to tell you that its in restore mode.
Alternative Method:
Step 1. Connect iphone to USB then listen to the sound when it connect and disconnect.
Step 2. Hold the home and power buttons until hear the disconnect sound then release power button.
Step 3. Wait until you hear another sound then release home button.