Thanks for the inquiry.
If there is another user's account on the Roku device, you will need to factory reset and re-activate the device under Roku account information. However, as you stated in your post, please be aware that the Roku LT (2700) is a much older device that is no longer supported.
For more information about how to perform a factory reset on your Roku device, visit our Support page here: System restart or factory reset your streaming device
If you ever need further assistance with your Roku device, please don't hesitate to let us know.
Roku Community Moderator