Firmware · critical

How to fixUEFI-BOOT-LOOP

System stuck in loop into UEFI/BIOS

What this error means

System stuck in loop into UEFI/BIOS is a critical-severity firmware issue. Every time the PC is started, the system automatically redirects to the BIOS instead of Windows. It's also often linked to change SATA mode (AHCI/RAID). See the troubleshooting steps below for the fix.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

0 of 3 complete
01Check the boot order

Check the boot order.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

I need help
02Turn on CSM (Compatibility Support Module) if you have an old MBR disk

Turn on CSM (Compatibility Support Module) if you have an old MBR disk.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

I need help
03Repair the boot sector with the bcdboot command

Repair the boot sector with the bcdboot command.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

I need help

Possible causes

  • Corrupted Windows Boot Manager
  • Change SATA mode (AHCI/RAID)
  • Corrupted system disk