If you find the reset button, you must depress it for at least 30 seconds to initiate a Factory Reset.
You can also initiate a Factory Reset via the menu system on the Roku TV:
Settings > System > Advanced system settings > Factory reset.
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.".
Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X