1] Check the boot sequence and boot mode This is one of the important solutions to fix this Default Boot Device Missing or Boot Failed problem on your Windows 11/10 system.

Here's a workaround Microsoft suggests if your device is failing to boot after installing the October 10 Patch Tuesday update.

Fix Your PC/Device needs to be repaired, The Boot Configuration Data for your PC is missing or contains errors with error code 0xc00000f.

If your PC is not booting and showing an "Inaccessible Boot Device" error, then here is a fix to resolve this issue and make your PC function normally. The inaccessible boot device is a common ...

Microsoft has fixed a known issue causing some Windows devices to boot into BitLocker recovery after installing last month's Windows security updates.