Reset is the wrong term. There are two similar functions under the System menu. One is to simply restart the Roku device. That's the same as unplugging the device from power for about 30 seconds. Nothing is deleted, and everything remains as is.
The second is a Factory Reset. DO NOT do this unless it is a last resort. This wipes the Roku and returns it to the same condition as when you first unboxed the device. Everything has to be set up again, including entering any login credentials needed by a channel.
There are times a factory reset is the best thing to do. Sometimes a channel becomes corrupted, and the only way to completely clear it is a reset. Note that it does not return to the version of the operating system that was shipped on the device. You will still have whatever OS version you have now. You have to link it back to your Roku user account, same as when it was new. It's time consuming, but at times it's necessary. At least you get all the same channels installed automatically, you don't have to go back and add in the channels you have now.
One more caveat about a factory reset. If you currently have a channel that is no longer available in the channel store (YouTube TV or Spectrum Cable are two examples), in theory those channels should automatically be added back in. But there's a chance they won't, and if they don't there's no way to get them back, period.
Dan
Roku Community Streaming Expert
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