You are not able to jailbreak a Roku device. It has not legal activity. Roku has a very strong closed operating system that does not allow Jailbreak Roku, but if you still try to Jailbreak Roku and are caught then you can be punished according to local law. So I humbly suggest you to avoid doing these kinds of activities and many more.
For detail information visit: https://thewebbings.com/can-you-jailbreak-a-roku/
