However, nothing is more frustrating than being midway through a critical restore process—perhaps trying to fix a boot loop or downgrade iOS—only to be stopped by the dreaded error message:

: Leo swaps his thin, aftermarket cable for an original Apple USB cable . He also moves the plug from the front of the PC case directly into a USB port on the back (motherboard) to ensure a more stable power supply.

If you have tried all 10 methods and the error persists, your device may have a degraded NAND chip or a damaged boot ROM. In that rare scenario, professional micro-soldering repair is required.