Use Installation Media to Access Safe Mode
You can use additional installation media when Windows 10 is stuck in a reboot loop. To access the boot manager, you can either go to UEFI/BIOS by pressing Del, F8, or F1 while the system boots, or select the recovery partition as the primary device and restart the computer.
For more information on creating Windows 10 installation media, you can refer to our guide. Both methods will guide you through using the Automatic Repair tool or give you access to the Advanced Options screen.