

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.








*he knew what he was tolkien about