After fiddling with this firmware compiling for literally 5 days straight, where tying tup in the command line give me a bunch of errors. Only to find out that downloading tup version 0.7.8 causes issues as windows detects that the file tup32detect.exe is a virus and removes it.
Now you can white list it or do as i did…
1- download version 0.7.6 from here
2- unzip and place the entire folder somewhere (say c:/tup-v0.7.6), make sure the tup32detect.exe file is there
3- in the search bar type env and click on Edit the system environment
4- click on environment variables
5- under system variables find Path an click edit
6- click new and add the path to the tup folder
Now you should be able to run tup in the firmware directory.
Hope this helps