After the BIOS update (to 2022/05/12-v3802), I lost opportunity to continue using Qubes OS.
My, a year ago installed vanilla Qubes OS, is still well booted to dom0, I can create an remove AppVMs, but I can’t start an AppVMs : because dom0’s PS/2 keyboard and a mouse stops working, the clock on the dom0 XFCE panel is working, dom0 terminals are delayed.
The Qubes OS live USB is not working, so I can’t reinstall the system as I do that before. I’ve already tried my early used for installation USB with v4.1.0 and a new one with v4.1.1 - the same result.
So, my dom0 is working perfectly, AppVMs and live USB are not working. (BIOS downgrade is blocked by the vendor ) The BIOS is in it’s default settings state, IOMMU and SVM Mode (CPU Virtualisation) are enabled.
Please, suggest ways to solve the problem. What are the BIOS settings I should try to change?
Obviously the right thing to do is to figure out what the incompatilibyt is so the community can help resolve it.
But if you are 100% sure this is down to the BIOS flash and you cannot wait for that to happen in order to get back in again, you could download an old version of the BIOS and use a programmer with a SOIC clip to downgrade to the version you had. While the manufacturer prevents downgrade via the internal programmer you can use external flasher to downgrade just fine. Make sure to check the version of the chip and that your programmer uses the right voltage for that chip.
The BIOS files come in a ZIP file and will contain a .CAP file. This CAP needs to be converted to discard the top 2048 bytes and then you have a ROM file that the GNU program ‘flashrom’ can use
than you just connect up the SOIC clip and programmer using a different machine, run flashrom and then thats it downgraded. Its also worth backing up the ROM thats on there too just incase.