I've successfully built LOS from source!: https://lisalist2.com/index.php/topic,644.0.html
One of my profiles has a Z8 with a piggyback ROM. I don't know if this has the LLF firmware (no version or part number in the documentation), or if it is a version of the "system firmware" (which are part number 341-0008B? according to the documentation). This one has a part number of 341-0080 and REV.B. Does anyone recognize this?
So this one?
Lame that it only works with Windows
I use my TL866II+ with Linux courtesy of the minipro utility.