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Article · 2026-05-15 18:56:00

Windows Boot Manager, USB Code 43 and BIOS Reset

Windows Boot Manager, USB Code 43

Content

If your ASUS ROG laptop suddenly:

  1. boots only into BIOS
  2. shows no “Windows Boot Manager”
  3. has greyed-out boot priority
  4. shows USB Code 43 errors
  5. or Windows installer cannot detect drives

after:

  1. BIOS reset (F9 / Load Defaults)
  2. Windows update
  3. Secure Boot changes

then your storage mode and Secure Boot configuration were likely reset.

Symptoms

  1. Boot menu empty
  2. Only “Launch EFI Shell” appears
  3. NVMe drives visible in BIOS
  4. Windows Recovery USB sees no drives
  5. USB ports unstable or not working
  6. Very slow boot/restart

Fix

1. Enter BIOS

Press:

F2

during startup.

2. Restore RAID Mode

Go to storage/SATA settings and change:

AHCI → RAID

Save with:

F10

3. Restore Secure Boot Keys

In BIOS:

  1. Security
  2. Secure Boot

Choose:

Install / Restore Factory Secure Boot Keys

Save and reboot.

Result

After restoring RAID mode and Secure Boot keys:

  1. Windows Boot Manager returns
  2. Windows boots normally
  3. USB devices work again
  4. data remains intact

Important

Do NOT:

  1. reinstall Windows immediately
  2. format drives
  3. create new RAID arrays
  4. initialize disks

If BIOS still detects the NVMe drives, your data is usually still safe.