If 3uTools continues to fail, switching to Apple's official tool is a powerful diagnostic and repair option.
Device stuck in DFU mode. Unknown error or Error 75 encountered. 3utools error unable to restore idevice75 link
If you have tried all these steps and are still facing the issue, it is possible that your iPhone has a , such as a damaged NAND flash memory, which requires professional repair. If 3uTools continues to fail, switching to Apple's
3uTools relies on underlying Apple drivers to communicate with your iOS device in recovery states. If these drivers are corrupted, Error 75 occurs. Open on your PC. Click on the Toolbox tab from the top menu. Select the iTunes Utility option. Click on Repair Driver . If you have tried all these steps and
Connect the device directly to a rear USB port on your PC's motherboard (avoid front ports or hubs) using an original Apple cable.
Outdated or corrupted Apple Mobile Device USB Drivers on your Windows PC.
Overactive antivirus software or firewalls on your PC may block communication with Apple's update servers.