: Temporarily turn off all security software and firewalls, then restart your computer. Close iTunes
Error 75 usually does permanently brick the device. After a failed restore, the iPhone or iPad often remains in recovery mode. Simply force restart it (press Volume Up, Volume Down, hold Side button until Apple logo appears) and try the fixes above. If the device cannot exit recovery mode, DFU restore with a clean IPSW is your best bet. 3utools error unable to restore idevice75 link
Note: If you do not use iTunes regularly, ensure you have the latest version of installed, which comes bundled with iTunes. : Temporarily turn off all security software and
Recent community findings suggest that 3uTools verifies battery health during restoration. If the battery is degraded, it may trigger error -75. : Open 3uTools, go to Smart Flash , select your firmware, and check the box labeled "Fix battery health" before clicking Flash. 2. Use "Quick Flash Mode" (Data Wipe) Simply force restart it (press Volume Up, Volume
(quickly press Volume Up, then Volume Down, then hold the Power button) while 3uTools is still running in the background to re-trigger the connection. External Firmware Download
