: iTunes (older versions like 10.x-11.x are most stable for this) and a Windows PC. : The custom file you intend to flash. Step-by-Step Guide Preparation Connect your iOS device to your computer via USB. Close iTunes if it opens automatically. Extract and run as an Administrator. Select Your Device

Your device screen should remain black (or show a green/white flash briefly). Restore via iTunes

Follow the on-screen prompts to put your device into DFU mode: buttons for 10 seconds. but continue holding for another 10–15 seconds.