Nikolaj has completed (?) his 4-part blog series on NVRAM formats in UEFI. Part 4 is on AMI’s NVAR.
https://habrahabr.ru/post/281901/
Here’s a pointer to the last edition:
https://firmwaresecurity.com/2016/04/16/nikolaj-on-nvram-formats-part-3/
I think that UEFITool NE has another alpha released, with some UI changes.