: Switch to a high-quality or original Apple USB cable and use a different port directly on your computer (avoid hubs) to ensure stable voltage.
: A common trigger is full internal memory , which prevents the device from mounting the APFS partition needed for the update. 3utools error unable to restore idevice75 link
Follow these solutions in order. Start with the simplest and work your way up to the more advanced hardware-focused fixes. : Switch to a high-quality or original Apple
A micro-interruption in voltage causes the Apple Mobile Device service to drop the link, corrupting the restore stream. Start with the simplest and work your way
: In 3uTools , navigate to Smart Flash , select Quick Flash , and check the "Fix battery health" box before starting the flash.
Conflicting background processes intercept the data connection.
| iTunes Error | Equivalent 3uTools Error | Meaning | |--------------|--------------------------|---------| | 9 | 75 | USB timeout | | 14 | 75 / -1 | Device not responding after iBSS | | 4013 | 75 | SEP / baseband mismatch | | 4005 | 75 | NAND read failure |
