If you are stuck in a boot loop, try entering (the "Connect to iTunes" screen) instead of DFU mode and attempt the flash again. Advanced Troubleshooting: The "Hardware Check"
Let 3uTools guide you into DFU mode using the on-screen instructions.
Ensure the device has at least 50% charge. A weak battery can cause the device to "brown out" during the high-power ramdisk loading phase.
The "Unable to load restore ramdisk" error in 3uTools is rarely a "broken" phone and usually a communication breakdown. By refreshing your drivers, using a high-quality rear USB port, and ensuring 3uTools is fully updated, you can typically bypass this hurdle and complete your restore.
A failing NAND chip or a damaged lightning port on the iPhone itself. Step-by-Step Solutions 1. Check Your Physical Connection
Outdated or corrupted Apple Mobile Device USB drivers.
Low-quality cables or faulty ports dropping data packets.