Graptolith

Hi together, I have a VTO2000a and a VTH1510CH (IP/LAN Version) and would like to update my firmware. (some problems with the communication between both devices, which I think to be solved by updating the firmware) Attached Firmwares (picture) have been provided by the support of my seller. But which Firmware should I install on which device? Maybe even better - do you know some link or so to download the actual firmware for my devices? Best regards Florian