ok was this your first update in a while? In oct autel released a new system version that wipes out all current vehicles. After the system update you need to reinstall every vehicle again. If you already had the newest system then there is a problem with the download. Either way try to reinstall cars from the update app.

Yes, as anytime unlock said, once you upgraded the system to the V2.99, it will erase all current vehicles software, you need to download all again. So please go to Update to finish the updating.