First be sure that both the USTVnow Plus addon and the USTVnow Guide actually updated. There is an issue in the way they depend on each other that caused neither to update on my box.uh oh something is wrong on my update
Updated, closed down Kodi, rebooted Firetv
Went into EPG guide
It hangs now at Loading data from external source, calculating remaining time
no shows every show up on my grid
Is there a Fix or a clear cache or something to fix this
If you go to Settings > Addons > Available Updates after the update has been started and see the two addons with Downloading 0% you can just click on the USTVnow Plus one and cancel the download. This will allow the USTVnow Guide to install. Then if you check for updates again the USTVnow Guide will install.
If you are sure you have 14.3.8 of USTVnow Plus and 1.1.8 of USTVnow Guide then do this to reset.
Find the USTVnow Guide under Addons > Program Addons and click it. Then go to Configure or Addon Settings and do a DB Reset. This should fix it.
If not then the guide.xmltv file and the source.db file may need to be manually removed. I set things up to not need any of this, but I only tested on my devices. Maybe something with Firetv.