I have been advised that MLB.TV no longer supports the ROKU device X00400UPAPOF installed in my mother-in-law's Sharp ROKU tv. Can the device be updated so that MLB.tv will support it and, if so, how? If it cannot, can a stand alone ROKU device that is current be attached to her tv to work around the device that is already installed?
I'm curious as to who advised you. The MLB.TV Web page says they support Roku TVs.
Verify your Roku model number and OS version/build at Settings > System > About
DBDukes
Roku Community Streaming Expert
Note: I am not a Roku employee.
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In answer to your last question, yes you can attach a Roku device to a Roku TV. It's no different than attaching something like a Blu-ray player. You have to use the TV's remote to select the proper input and then use the device's remote to control the Roku.
However, I'd have to agree with @DBDukes . I'd be surprised if there were any Roku TVs that don't support MLB.tv. None of them are on Roku's no longer supported list.