What is UEFI-BOOT-LOOP?
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.
Common Causes
- Corrupted Windows Boot Manager
- Change SATA mode (AHCI/RAID)
- Corrupted system disk
Step-by-Step Fix Guide
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1
Check the boot order
Start with Check the boot order — it clears the most frequent root cause behind UEFI-BOOT-LOOP in the majority of cases we've seen.
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2
Turn on CSM (Compatibility Support Module) if you have an old MBR disk
When the first step isn't enough, the later steps handle the edge cases tied to sw-bios instability.
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3
Repair the boot sector with the bcdboot command
"Repair the boot sector with the bcdboot command" is worth trying when corrupted Windows Boot Manager turns out to be the culprit.
Commands & Diagnostics
bootrec /fixmbr
bcdboot C:\Windows
Frequently Asked Questions
UEFI-BOOT-LOOP is most often triggered by corrupted Windows Boot Manager. Other reports point to change SATA mode (AHCI/RAID) and corrupted system disk as contributing factors.
Try "Check the boot order" first — it resolves most UEFI-BOOT-LOOP cases on its own. Only work through the rest of the guide above if it comes back.
UEFI-BOOT-LOOP is rated critical severity in our database. It's worth acting on quickly rather than letting it recur.
You shouldn't need to. Work through the guide above first — a reinstall is only worth considering if none of those steps help.
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