1. Netf?Most of the android tv boxes are not support it because of the copyright issues, we pre-install it that can work, but it wont work once updated or re-installed. We can offer you a new version of it.
2. Remote cant navigate on some APPs? It is a common issue for most of android tv box that hard to navigate on some APPs using the remote (such as Netf), as these APPs are mainly provided for tablets and phones that have touch screen settings or mouse. You can connect a mouse or a wireless keyboard to control it.
3. Apps cant be found on Google Play Store? Search apkpure or download the APP APKPure which can install the APPs you want.