TCL Roku 5103X. Was playing around trying to get mirroring so I could watch Facebook videos on the TV. Installed Chromecast. No luck. Installed Fire TV stick. Still no luck. Also added a casting channel. Now keep getting the following recurring message that pops up every few minutes -- even when the TV is turned off:
"VIDEO & TVCAST
UPGRADE TO PRO TO ENABLE AWESOME FEATURES LIKE REMOTE AND AD-BLOCKER."
I disconnected the Chromecast and Fire TV stick. Removed the one casting channel I'd added. Went to "mirroring" section under Settings and checked "Never Allow." Also unplugged the TV for a few minutes before plugging back in. Nothing worked. Still getting the message every few minutes and the only thing that works to get out of it is to hit the "Home" button. The TV right now is useless and I'm at my wit's end. Can anyone help?