Steps to use Windows Startup Repair to fix reboot and select proper boot device error.
1. Access WinRE: Restart and press F8 or similar, or let WinRE open automatically after multiple boot failures.
2. Select Startup Repair: Go to Troubleshoot > Advanced options > Startup Repair.
3. Run the Repair: Choose your account, enter your password if prompted, and let it scan for issues.
4. Restart to check if the problem is resolved.
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