Hi this may help you with ZMT-640PVR

https://www.dropbox.com/sh/99ijdy2d5vkvke5/LjsBjkHYYL

especially:

https://www.dropbox.com/sh/99ijdy2d5vkvke5/c2K2C_0w9u/Recent%20%60ZMT-640-PVR%20Issues.txt

cheers

I found this by emailing grahamw@gmx.comfrom the freeview website.