Microsoft May security patch fails for some due to boot partition size glitch

“Something didn’t go as planned. Undoing changes.” That’s all the clue some Windows 11 users will get when Microsoft’s May Security Update fails to install because of insufficient free space on the EFI System Partition (ESP), leaving their systems unprotected against the dozens of patches it contained. This issue affects devices with limited free space available — typically 10MB or less — on the ESP.