BIOS / UEFI Error Code
Systems & Devices
BIOS / UEFI
BOOTMGR IS MISSING | Boot loader missing
Industry
Systems & Devices
Canonical
/systems/bios-uefi/error-codes/bootmgr-is-missing/
Last Updated
Feb 27, 2026
Summary
The system cannot find the Windows Boot Manager on the selected boot device.
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What This Code Means
“BOOTMGR is missing” appears early in the boot process when firmware hands off to a bootloader, but the expected boot manager file is not present or cannot be read on the selected boot device. It can result from boot order issues, drive problems, or corruption of boot files.
Where Users Usually See This Code
- Immediately after powering on a PC
- After changing boot order, drives, or firmware settings
- After cloning or repartitioning a drive
Why This Code Appears
- Boot device selection points to a non-bootable drive
- Boot files are missing or corrupted
- Drive or filesystem cannot be read reliably
What Typically Happens Next
- The system stops booting and waits for user action
What This Code Is Not
- It is not a Windows “login” problem
- It is not a GPU/monitor issue
Troubleshooting Checklist
- □ Check firmware boot order and select the correct system drive
- □ Remove external USB drives that may be taking boot priority
- □ Use official OS recovery media to repair boot configuration if needed
- □ Back up data before attempting repairs that modify partitions
Notes And Edge Cases
UEFI vs Legacy boot mode mismatches can cause bootloader errors after drive moves or reinstallations.
Related Codes
8 links
- BOOT FAILURE CodeInsert system disk
- BOOT DEVICE NOT FOUND CodeBoot device unavailable
- NTLDR IS MISSING CodeLegacy boot loader missing
- NO BOOTABLE DEVICE CodeBoot device missing
- OPERATING SYSTEM NOT FOUND CodeNo OS detected
- REBOOT AND SELECT PROPER BOOT DEVICE CodeWrong boot device
- A DISK READ ERROR OCCURRED CodeDisk read failure
- PXE-E61: MEDIA TEST FAILURE CodeNetwork boot attempted
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