4 hours ago, Coulomb said:

You can compare this with the manufacture date of your inverter, to decide if it's worth updating with this firmware.

I understand. Then how may I find the manufacture date of our inverter here?
From your words one could conclude that either factory's firmware 75.85 or x75.85 would be better than remaining with the installed 75.08 present version.

How to find out about issues and configuration workarounds of the actual 75.08 version, in case there is any?

I am presently experiencing serious functioning issues described in this post that I am so far unable to understand. Will welcome information, links to discussions, all really to help me get a better insight into this situation. I have installed Voltronic Axpert inverters in the past, and were smooth experiences.
Thanks

21 hours ago, Nspace said:

Then how may I find the manufacture date of our inverter here?

Usually there is a small sticker over one of the screws holding the front cover on. It will have a year and one month blacked out. For example, the one below has a manufacture date some time in May 2018:

21 hours ago, Nspace said:

From your words one could conclude that either factory's firmware 75.85 or x75.85 would be better than remaining with the installed 75.08 present version.

That depends. If your manufacture date is considerably later (say 6 months or more) than the firmware, then you might decide it's not worth regressing that far.

21 hours ago, Nspace said:

How to find out about issues and configuration workarounds of the actual 75.08 version, in case there is any?

Alas, that information has not been published for many years, ever since the appearance of the clones. The best you can hope for is a vague clue in the file name of the firmware update file, e.g. "fixes fan speed at low power". But we don't have a firmware update file for 75.08 (except for one that is for an Axpert King rack mounted; a totally different firmware with confusingly the same version number).