are you able to find compatible ethernet adapters to use for this model or do none work? the support page shows no option for this model
No, the 3930X (Roku Express, released Sept 2019) is b/g/n single band (2.4 GHz, not 5 GHz) WiFi only. Its USB port is only used for powering the unit -- other USB functions are not supported.
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well. If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X