App with old iPad - Grafana fails

Hi,

i am thinking of using my old and outdated iPhone Air (2nd gen, iOS 12.5.5)

I can install the HoAss app and it starts (well, not too fast but who cares) and connects to my server.

In the dashboard I can see alls information and switch the light and devices.

Unfortunately, when I try to open the Grafana it takes a while (do not care…) and then it says:

If you're seeing this Grafana has failed to load its application files
[...]
5. Check if your are using a non-supported browser. [...]

I guess the information is leading into the wrong direction. However. Someone having an idea how to get it running on this old iPad?

I would like to fix it on the wall as a remote unit for my HoAss server.

Any ideas?

Thanks!

/KNEBB