Title should say Windows 10 version 1607, 1703, 1709, 1803, 1809, 1903 and 1909: February 11, 2020 update. This patch modifies UEFI to close a security hole bu

Title should say Windows 10 version 1607, 1703, 1709, 1803, 1809, 1903 and 1909: February 11, 2020 update. This patch modifies UEFI to close a security hole but trashes the boot certificates and thus blocking boot up after update on some PCs. I've been setting update delay to one day on client PCs to give MS a day to pull a bad update. Looks like I need to set that to 4 or 5 days to avoid disasters like this.