Do you have any screenshots of that Zgemma box interface or anything? Do you know which VPN technologies it supports? Do you at least have an exact model/brand so we could Google some more info on it?
Does the Zgemma run Enigma 2 OS? If yes you can search the forum for enigma2 as this has been discussed in detail already.
But the best solution is to run PIA on a router (Access Point) running DD/OpenWRT - I highly recommend this little beauty (great product, good price, excellent support and dummy proof):
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But the best solution is to run PIA on a router (Access Point) running DD/OpenWRT - I highly recommend this little beauty (great product, good price, excellent support and dummy proof):
https://www.gl-inet.com/ar300m/