Try another Factory Reset yourself: Settings/System/Advanced system settings/Factory Reset/<enter code>/Ok
If you still cant add channels (they actually should "Auto-Add" since apps are linked to the account, not the device), message @RokuDanny-R or @RokuKariza-D or @RokuMary-F with your account/device details (Device ID/Serial # from Settings/System/About) and a brief description of the problem and they may be able to help you further.