"Any BIOS upgrade" can break your machine? You must be buying hardware from a company that ships stuff without testing.
I upgrade the BIOS in my Dells, HPs, Asus, IBMs and other systems regularly, and have yet to have a system "break completely". About 4 years ago I had a Proliant upgrade cause some minor issues - but that was solved by rebooting and choosing the "use previous BIOS" option. (HP puts two banks of NVRAM into the system. An upgrade replaces the "old" version, then marks that bank as "current". A BIOS setup option lets you choose the "current" bank or the "backup" bank.)