You might need to access BIOS to change how the device works or to assist in troubleshooting a problem.
It's BIOS that's responsible for the POST and therefore makes it the very first software to run when a computer is started.
If you determine to flash BIOS, you are taking a personal risk of BIOS flash failure.
If it doesn't, and the motherboard supports Dual BIOS, that BIOS backup can be restored to overwrite the corrupted version.
The BIOS in some of the first IBM computers were not interactive like modern-day BIOSes but instead only served to display error messages or beeps codes.
Any custom options were instead made by modifying physical switches and jumpers.
It wasn't until the 1990s that the BIOS Setup Utility (also known as the BIOS Utility, or BCU) became common practice.