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KB500071861 fails in reboot stage & backs out. Failed 5 times.
The important KB5001786 operating system update is repeatedly failing to install on one of my computers (but installed OK on a similar machine I have).
I have tried five times, four using Windows Update and once using the MSU file. In all cases the failure occurs during installation reboot phase, at the 95% complete point or perhaps a bit further than that. The update is then backed out (automatically uninstalled).
I have Win10 20H2 build 19042.1288, 64 bit, on a Lenovo E560.
The bios and drivers are all up to date, and Windows is fully updated except for this problem with KB5001786. After the first failure I ran SFC /scannow, and although that made some corrections it didn't help. (I successfully installed this update another E560 that has had the same bios & driver updates as this one, so I doubt this is a hardware problem.)
What can I do? If there is no existing remedy, how can I get Microsoft's attention for a fix to be devised?