As for the firmware - the update disk set containts only "MAP" data, and doesn't have "HD13" partition inside of it, so it means that we don't have a source for FW update, unfortunately...
I have extracted the zip successfully without error, so it should be ok.
There is a TU05 folder on the original disks, wich contains a file: LOADING.KWI. I think that is the firmware. On the HDD I found a partition with a folder containing a similar LOADING.KWI. The file version on the HDD is VA05100L. The version on the 2015-2016v2 disks it is VA05113A. That's why I think it is the firmware, but I'm not sure how to upgrade it. Maybe we only need to overwrite it on the HDD. On GEN6 it is a standard process, as far as I know.