If I recall correctly (many years have passed) that was used to recover from the effects of Chernobyl virus: https://en.wikipedia.org/wiki/CIH_(computer_virus)

If I recall correctly (many years have passed) that was used to recover from the effects of Chernobyl virus: https://en.wikipedia.org/wiki/CIH_(computer_virus) https://en.wikipedia.org/wiki/CIH_(computer_virus) but (for whatever reasons) it didn't work on all motherboards, and when it didn't work the hot swap method was used/needed. I remember fixing a couple motherboards with the latter, being lucky enough to find a similar BIOS chip from a stack of broken motherboards at a local computer shops.