http://thinkdeploy.blogspot.com/2017/01/thinkpad-bios-to-uefi-conversion-using.html?spref=tw
http://thinkdeploy.blogspot.com/2016/08/the-think-bios-config-tool.html
Some related Lenovo BIOS tools:
https://support.lenovo.com/us/en/documents/ht100612
http://support.lenovo.com/us/en/downloads/ds014169
http://support.lenovo.com/us/en/products/laptops-and-netbooks/thinkpad-l-series-laptops/thinkpad-l420/downloads/ds019499
[I confess still not understanding what this “BIOS to UEFI” thing that Windows admin tools now have. Is it switching from Legacy to UEFI firmware then redoing the OS bits to handle that? Why are these boxes using Legacy mode in the first place? Oh well.]
Firmware Security 