Windows 11 update rendering issues on the boot drive.
Windows 11 update rendering issues on the boot drive.
If it hasn't been refreshed recently (or ever), I'd make the update. It might include support for Windows 11 specifically. Typically, you'll want to verify security settings, ensure TPM 2.0 or Firmware TPM is active, and enable secure boot—all necessary for 11 as well. The unusual part is that after updating to 11, the drive doesn't appear in the BIOS. In that case, a BIOS update seems like the next logical step.
I believe the issue hinges on several factors—how the 11 install behaves, whether a preliminary file copy happens before booting, or if it freezes on a logo or black screen. Typically, when an installation fails and then restarts, it reverts to the last stable Windows version. There could be various reasons behind this problem.