Solution: buy computers with "generic" motherboards, not OEM boxes. I have had like 5 different motherboards in the last 10 years and all could be updated from

Solution: buy computers with "generic" motherboards, not OEM boxes. I have had like 5 different motherboards in the last 10 years and all could be updated from a flash drive with the BIOS setup. And yes, this required user action, they didn't just automatically flash random files from pendrives present during POST ;)