The manual update check will not override Roku's deployment schedule. I've heard, but cannot confirm, that a factory reset will force the update to the latest version.
The Roku 3 was an exceptional piece of equipment when it came out, and still provides great service in most regards. But it is lacking in some features, and I'm sure it's time will come that Roku decides to move it to the legacy group and no longer provide support. Of course, even when it's declared legacy it will continue to function. Individual channel providers make the decision about when to cut off support for those older boxes, not Roku. Roku just stops providing OS updates to devices in the legacy group.
Dan
Roku Community Streaming Expert
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