My setup is not perfect, and needs a bit of tinkering, but might adjust to what you want: Xiaomi Mi Box S TV with custom DNS blocking all tracking from Xiaomi and Google.

For apps I mostly use F-Droid via the client Flicky, but I also have a throwaway account on the Play Store for some case where I need an app from it.

I have an older Mi Box model, I’m not sure if it’s still possible to change the DNS in newer models, but since you are looking for second hand, this should suit you.

Years ago I found instructions on Reddit on how to change the DNS in the Mi Box, and switched to NextDNS, where you can activate several blocklists to block tracking and ads, and it has specific lists for Xiaomi and Google. If you are interested I can look for the instructions and share them with you. The only thing needed to do this is a remote ABD shell app on your phone, I used the one recommended in the instructions I found, from the Play Store (this one), but there might be alternatives in F-Droid.

If you search for OpenWRT tutorials on youtube you will find a McFly or something like that name

Could that be OneMarcFifty?

Thanks for your answer. I wasn’t sure what “you have cable” exactly meant, but after seeing BrightCandle’s comment I looked at my ISP contract and it mentions VDSL 50, so I guess I don’t need a separate modem then.

Thanks for your answer! I wasn’t sure about the whole “Cable / FTTH / DSL” issue, but checked my ISP contract and it mentions VDSL 50, so I guess I’m on DSL and don’t need a separate modem. I’m in Europe, by the way (might be relevant to different technologies and devices available), I’ll update the post now to add that.

Is this the pastor that gave him the bible quote from Pulp Fiction?