Wow, thanks for finding all that! I had not researched down in the weeds that deep yet. I've done some more research today and it seems all of these high end players are not Google certified and are actually still using very old Android OS versions (Version 6.0 from 2015, and in some cases Version 5 from 2014). That's too bad because the hardware is really excellent.
There is a side-install work around for Netflix on these Zidoo. You have to go into security settings and "allow outside install programs" or something. But that is only for netflix and you have to get the install directly from the netflix site.
There is one Zidoo device that seems to be newer - Zidoo H6 Pro. This runs a slightly newer Android 7.0. All indications do say that the H6 does support Google Play and Netflix 4K HD. You can upgrade this one with a 5V linear power supply, but you probably have to figure out the proper size DC plug.
So, yeah, the Nvidia Shield Pro has a newer Android TV 9.0 OS and pretty much supports everything, but the power connector is proprietary and will be difficult to upgrade to linear power supply.
I did find a product called Himedia S500 that also runs the Android TV 9.0 and indicates it is fully GooglePlay certified. It is so new that it's not yet available from a US distributor. You can order it from a UK/Germany distributor. Not that expensive at about $98. You can also upgrade to 12V linear power supply, and you will have to figure out the proper DC plug for this.
An Sbooster with all those different plug adapters could be an easy answer for the Zidoo H6 Pro or the Himedia S500.
There is a side-install work around for Netflix on these Zidoo. You have to go into security settings and "allow outside install programs" or something. But that is only for netflix and you have to get the install directly from the netflix site.
There is one Zidoo device that seems to be newer - Zidoo H6 Pro. This runs a slightly newer Android 7.0. All indications do say that the H6 does support Google Play and Netflix 4K HD. You can upgrade this one with a 5V linear power supply, but you probably have to figure out the proper size DC plug.
So, yeah, the Nvidia Shield Pro has a newer Android TV 9.0 OS and pretty much supports everything, but the power connector is proprietary and will be difficult to upgrade to linear power supply.
I did find a product called Himedia S500 that also runs the Android TV 9.0 and indicates it is fully GooglePlay certified. It is so new that it's not yet available from a US distributor. You can order it from a UK/Germany distributor. Not that expensive at about $98. You can also upgrade to 12V linear power supply, and you will have to figure out the proper DC plug for this.
An Sbooster with all those different plug adapters could be an easy answer for the Zidoo H6 Pro or the Himedia S500.