So in a half sleepy daze I screwed up. I used UUPDump.net to create a AIO iso of the latest insider build. So far so good. Go to install windows and select the wrong SKU. I accidentally installed the Teams SKU (the SKU meant for the surface hub). Get into the main OS and realise yup something's wrong as it's 100% different. Try rebooting into installer USB however it just returns to boot menu. I tried a Ubuntu usb and the UEFI will happily boot into that but the working Windows install stick it will not boot into but will on other PCs. I did some Google-foo and found something similar on reddit (/r/WindowsHelp/comments/tt4d8v/comment/i2w7m9r/) . It suggested it potentially set some uefi variables which is blocking the boot. I tried his solution and have had no luck Is there any documentation on what modifications this makes to the UEFI? So far tried: -tried booting with F12 boot menu -Boot the efi of the installer with grub chainloading. - cleared secureboot to default and trusted efi - disabled secure boot and tried booting incase it applied a update -Tried booting efi directly from uefi shell Would try legacy mode boot but not supported by the bios
From what I know it locks down the system using the TPM and SecureBoot. Completely resetting the TPM and the Secure Boot keys to factory state should get you back on track.