

Boot into your working Windows 10 version 1909.It also requires a fresh install so please make sure to create a backup. The solution we came up with is not obvious and straightforward unfortunately.

We even tried converting the working Windows 10 (1909) to a VMWare virtual machine and tried an upgrade there but it also ended up with a rollback.

Upgrade using Windows Update (1909 -> 2004) fails with a BSOD (KMODE_EXCEPTION_NOT_HANDLED).We faced this problem ourselves but also found more people on the Internet with same symptoms: Some computers with different hardware may encounter BSOD (Blue Screen of Death) with KMODE_EXCEPTION_NOT_HANDLED error code when trying to upgrade to Windows 10 version 2004 from previous versions (1909).
