Avoid USB hubs or front-panel PC ports. Plug directly into the motherboard (the back of the PC) or directly into the side of the MacBook. Step 3: Enter DFU Mode (The "Deep" Reset)
The "3D" in the error code often points to a data transmission interrupt. loader for iphone9 3d101ap not found better
Release the but keep holding Volume Down for another 10 seconds. Avoid USB hubs or front-panel PC ports