The Qubes site goes as far as saying if AEM detects the bios has been changed there is no solution and to buy a new computer.. I just found that document
Is an L15 any different than a normal laptop that would guarantee you can flash it without the firmware someone flashed previously interfering with the flash process?
I am guessing the Qubes site recommends that because they don’t believe a clean copy can be re-flashed with 100% certainty.. Although I’m not sure, and they don’t explain it.