Windows 10 20H2 update consistently bricks machine ...

Raphael Van den Eede 1 Reputation point
2021-08-24T14:08:54.527+00:00

My dad has a Lenovo m90p desktop machine that is consistently getting bricked each and every time 20H2 manages to get past. Invariably this results in "Missing operating system" at the first reboot after 20H2 gets itself installed. Countless hours have been spent trying to fix this. Some blamed Lenovo update software, which we removed. Some said the BIOS needed to support UEFI - hence BIOS upgraded, still no good. Each and every time the same "Missing operating system" with a corrupted file system, leaving C: inaccessible and requiring a full system restore (Veeam), untill inevitably 20H2 manages to wiggle itself in again. We resorted to using Wushowhide, which helped for about 6 months, but this now seems to have developed amnesia and has forgotten that it was supposed to hide 20H2, so, yes, "Missing operating system", file system corrupted ... again. Now even if we remove the network connection and remove Windows\SoftwareDistribution prior to rebooting the machine, 20H2 still seems to install itself as soon as we reboot, and next is ... "Missing operating system" - you guessed it.

Does anyone out there have a fix for this that does not imply either missing out on security updates, buying a new machine, or just abandoning Windows?

Windows 10
Windows 10
A Microsoft operating system that runs on personal computers and tablets.
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  1. Limitless Technology 39,416 Reputation points
    2021-08-25T09:55:16.65+00:00

    Hello Raphael,

    This issue may occur if one or more of the following conditions are true:

    The basic input/output system (BIOS) does not detect the hard disk.

    The hard disk is damaged.

    ******** of the physical hard disk drive has an incorrect or malformed master boot record (MBR).

    Note Some third-party programs or disk corruption can damage an MBR.

    An incompatible partition is marked as Active.

    A partition that contains the MBR is no longer active.

    Solution 1. Check If Hard Drive Is Detected by BIOS
    Solution 2. Test Hard Disk to See Whether It Failed or Not
    Solution 3. Set BIOS to Default State
    Solution 4. Rebuild Master Boot Record

    In most of the cases Solution 4 works, Visit below link go through the commands which will be useful.

    https://answers.microsoft.com/en-us/insider/forum/all/pc-says-missing-operating-system-need-help/6f5f95f1-efc2-44a5-90f3-12ef5859ce0f

    --please don't forget to upvote and Accept as answer if the reply is helpful--

    Thanks,
    Mohammed S

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