I have STB NowTV 4200TT (Roku 3) but i don't use NowTV service now. Is it possible to run STB without NowTV account or to flash my STB on Roku firmware?
There is no official way of doing that. Any unofficial way, should it exist, would be a violation of the terms of this forum.
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
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And even if you did, it would be a poor choice. The Roku 3 is very old and underpowered. Some services no longer support that model.