: This is almost always caused by a driver conflict. Use the driver utilities inside your tool or 3uTools to wipe your USB stack and apply the Apple mobile device filter driver again.
Make sure your LibUSB drivers are up to date.
Reinstall Apple drivers using the "Flash & jailbreak" utility tab inside 3uTools. Boot Loop / Apple Logo Stuck Force restart the phone by holding Power + Home.
[Windows PC] ──(Custom Ramdisk Tool)──> [Exploit Injection via DFU] ──> [Delete Setup.app] ──> [Bypass Successful] Step-by-Step Instructions: