IIRC Windows 11 will no longer boot from MBR partitions & you have to convert th...

little_panda · on April 21, 2022

It will; there are tweaks out there that explicitly allow for installing windows 11 on an mbr partition.

Hint: download the latest version of Rufus, point it to a windows 11 iso and select the "Extended installation" mode. The result will happily install itself onto an MBR partition.

I performed an upgrade (!) of a windows 10 installation to windows 11 in this manner; I'm writing from this SSD right now.

  PS C:\Users\alexa> $(get-disk | ? {$_.IsSystem}).PartitionStyle; [System.Environment]::OSVersion.Version 
  MBR
  
  Major  Minor  Build  Revision
  -----  -----  -----  --------
  10     0      22000  0