![]() ![]() I tried deleting the ipsw file, disabling McAfee, rebooting, other USB-ports, uninstall and reinstall iTunes 9.2. Again.because I had the same problem with 3.1.3 ( ). Click the start button once the device has been detected which make you get to know how to fix error 21 on iPhone. Connect the device to the system and launch it. Step 1: Download and install the program. And every time I place it in DFU mode, then restore with iTunes I get an error 21, if not in dfu mode 1603,1604, 1611. After a manual reset of the iPhone (off/home) I get the error: Iphone could not be restored. To remove iTunes error 21, the process to be followed is as under. ![]() However, each time when I get to 25-50% of the restore process it freezes. After downloading iOS4 for my iPhone 3GS the upgrade proces broke off. ![]()
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