Don’t rely on file names alone. In 3uTools:
How to Fix 3uTools Error: Unable to Restore iDevice (-75) If you are trying to flash or restore your iPhone or iPad and hit the dreaded in 3uTools, you aren't alone. This error typically surfaces during the "Sending Filesystem" or "Restoring" stage. 3utools error unable to restore idevice--75-
If the restore fails repeatedly at the "Writing Filesystem" stage, it may be a physical battery failure. Technicians often bypass this by using a DC power supply Don’t rely on file names alone
: If using a desktop, plug the cable into the rear USB ports directly on the motherboard. Avoid using USB hubs or front-panel ports, which often provide lower power and less stability. 2. Refresh Drivers and Software If the restore fails repeatedly at the "Writing
In 3uTools, go to , select your firmware, and ensure the "Fix battery health" box is checked before clicking Flash. 2 Optimize Power