An article from the ATM industry on BIOS:

ATM malware attacks: Head them off at the BIOS
May 19, 2017 | by Suzanne Cluckey

[…][Our concern] as a control company is making sure that the network vulnerabilities are sealed up … we continue to see attacks on the BIOS. Finding a toolset that allows you to change the password, change the settings and secure the BIOS of those machines is important to a lot of those customers.[…]

https://www.atmmarketplace.com/articles/atm-malware-attacks-head-them-off-at-the-bios/