This is the most current HDA600 firmware to correct the Watch TV app issue.
 
Once the file is downloaded to the computer, move the zipped file to a USB thumbdrive and insert into the Media Player.  
 
On the Media Player, go to Settings > Update > Install (USB update)
 
The unit will restart a few times during the upgrading process.
After the unit has completed the download and you still receiving an error message 202 or 204, then please go to the home page and go to [Apps] icon. Toggle to the WatchTV app and uninstall it by pressing and holding down "OK" button on the remote, then toggle to [uninstall] "OK" Go back to the home page and press "OK" on the [TV] icon and the WatchTV will reinstall the updated version.