Restore. IPSW steps:
1. Download the. IPSW firmware (zip file can be extracted) corresponding to the mobile device.
2. Connect your mobile device to a computer with itunes installed, unlock and trust this computer
3. Start itunes, select the mobile device, then press and hold the option key (Windows users hold down the SHIFT key), click the "Recover ..." button,
In the File open window that appears, select the. ipsw file to begin the recovery.
DFU forced Brush: Skips the Iboot boot program of the mobile device (it verifies the firmware version and prevents the downgrade of the firmware) and uses itunes to swipe into any version.
Steps to enter DFU mode for mobile devices:
1. Connect your mobile device to itunes
2. Method One: Press the Power key of the mobile device +home key for 8 seconds to force shutdown, release the power button, hold the home button for 8 seconds, and so on itunes will recognize the DFU mode released.
Method Two: Turn off the mobile device, install the Power key +home 10 seconds (to be accurate), release the power button, continue to hold the home button, and so on itunes recognized the DFU mode released.
3. Press and hold the option key on the computer keyboard (the Windows user holds down the SHIFT key), click the "Recover ..." button and select the. ipsw file in the File open window that appears to begin the recovery.
ITunes 12 recovery. IPSW Firmware