After installation of KB4056892 boot failure, after roll-back error 0x800f0845

Anonymous
2018-01-04T22:13:27+00:00

Hi,

I have older AMD Athlon 64 X2 6000+, Asus MB, after installation of KB4056892 the system doesn't boot, it only shows the Windows logo without animation and nothing more. After several failed boots it do roll-back then it shows error 0x800f0845. Unfortunately, it seems it's not easy to disable the automatic updates without gpedit tweaks, so it tries installing and rolling-back the update over and over. The sfc /scannow shows no problem, in-place upgrade also doesn't seem to help. I can try full reinstall, but I doubt it will change anything. It seems like the update is binary incompatible with my old CPU. I understand that making the machine unbootable is the best protection from remote exploitation, but I would rather have the OS working. Especially if my CPU is not vulnerable to the Meltdown attack and the MS mitigation attempts for Spectre is more than questionable. I could find only some German and Italian people reporting the same issue (well the CPU is quite pre-historic and the KB update is very fresh), but no info / acknowledgment from the MS so far. I have Czech localization. Could anybody provide more information?

Windows for home | Windows 10 | Windows update

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  1. Anonymous
    2018-01-28T14:28:52+00:00

    If you can get to a command prompt then you could run a scan to ensure you still have disk consistency. SFC /SCANNOW 

    Tried this as well though I do not have any reason to suspect the file system being corrupt. When entering CMD Prompt (from the Win 10 recovery menu), it must create some sort of virtual drive. The initial default drive is X:\ and it doesn't allow me to change to any other root directory (actual Win 10 install directory is E:\ for whatever reason). Though I can still see the contents of other drives. And because of this, SFC reports it is unable to perform the task and exits.

    I really wish there was a simple way to revert some of the updates to get this back to a working state. With no system restore points though, it's not looking good. I suppose the next option is a "PC Refresh" where I can maintain personal files but will need to re-install programs and such. Which could be beneficial as some unintended "house cleaning".

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  2. Anonymous
    2018-01-28T14:22:21+00:00

    Egy tiszta ujratelepítést csináltam és megoldódott a probléma a bild szám nem stimmelt.

    Thank you for the response. I was hoping to avoid this course of action but will keep it mind as a last resort.

    Köszönöm a választ. Reméltem, hogy elkerülhetem ezt a cselekvési folyamatot, de végső megoldásként tartom szem előtt.

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  3. Anonymous
    2018-01-28T10:34:38+00:00

    On the black screen, I can ctrl-alt-del and get to the menu where is displays task manager, log off, switch user, etc. but selecting task manager just takes me back to the black screen. I can switch users but each user just goes back to the black screen. What's even stranger yet, the only keyboard combination command that functions on the black screen is Win-P. Which shows the (4) monitor display options. Primary is selected and I cycled through the other (3) options with no different results. 

    Have you tried starting Narrator to help with workarounds?   Win+Ctrl+Enter.  Do you have a second monitor to attach?   It sounds like your video driver is a problem.  You could use the Login screen's Power button's Shift-Restart command to get into the Advanced Boot Options to try using Low video resolution with a retry.  This would be an even simpler option if you had a boot menu to start from.

    Good luck

    Robert Aldwinckle

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  4. Anonymous
    2018-01-28T08:09:03+00:00

    If you can get to a command prompt then you could run a scan to ensure you still have disk consistency. SFC /SCANNOW

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  5. Anonymous
    2018-01-28T06:54:14+00:00

    Egy tiszta ujratelepítést csináltam és megoldódott a probléma a bild szám nem stimmelt.

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