Windows 10 versions 1709 and prior have had no boot up problems on my laptop, but starting with build 1803, continuing into build 19, Microsoft Updates have routinely (more than 10 times) bricked my laptop. I have reproduced the issue now ten times, each time from a fresh windows install, and in one case, the updates were installed and NO third party apps or drivers or anything were installed, and the system failed to boot from its consumer SSD main disk, one case reproduced with UEFI boot, disk is formatted GPT, one case it's formatted MBR, and bios is set for non-UEFI legacy boot. I can't confirm if one of those updates is on my non-bootable system but I can state the following symptoms, which include that the failure to boot always happens after installing an update. Recently Microsoft has been releasing updates that may or may not contribute to systems becoming unbooteable (known colloquially as 'bricking my system'). The system runs Windows 10 build 1709 fine, and as long as it is never booted beyond that build it never bricks itself. The system is a Lenovo thinkpad (edge series) E560 which has Lenovo Vantage/Update on it and has been updated to the latest bios and drivers as of April 24, 2020. (Two to the power of 8 combinations, of UEFI with secure boot on and off, SGX on and off, powerstep on and off, power save on and off, and so on.) BIOS options, especially UEFI specific boot options, have been noted, and tried one by one, in all possible combinations. 50% of the time it hangs hung prior to showing the repair screen, and 50% of the time, it completes its automatic repair and reboots, or says it couldn't repair anything, and lets you access advanced options, all of which also do nothing to restore reboot. The replacement for Safe Mode, is that several failed boots leads to 'Preparing Automatic Repair' which never gets to the repair screens. (If you boot from a recovery usb media, and go to a command prompt, and run bootrect /rebuildbcd, it reports zero windows installations detected, a classic symptom of total BCD corruption.) I have reason to believe that windows updates have trashed the content of the BCD registry and in a way that the command line prompt tools cannot repair. My system is stuck in an unbootable state, the thing we used to know as 'Safe mode' no longer really exists in a meaningful way in Windows 10 build 1909.

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