Is your firestick jailbroken (chipped) ? No, but I can sideload apps through downloader Your Sony is either the W70c or R5c going from my back catalogue date of manufacture 04/2016. Model 43x8307c
Not wanting to say much on here about the various apps other than I have an Android box.
@Mike11 has gone quite – hope he hasn’t got stuck in the snow 🙂