The network might be overwhelmed and it may take quite a significant time for a new transaction to be confirmed, especially if a lower fee was set (it can be hours or even day). You just need to wait. Your transaction will be either confirmed or returned to your wallet.
If you can access your account with the 3rd party wallet, then the Trezer integration seems to be working and the issue is most likely with the given wallet's interface. Please contact their support directly with your inquiry.
Most likely something went wrong during the firmware update and your Trezer got wiped (this is a security feature). There is no need to worry, all you need to do now is run a recovery process using your recovery seed words. You can find a manual on how to recover your wallet.
Please try clearing your browser's cache and refresh the page. Also, if you are using VPN, certain advanced Firewall or Antivirus settings, browser extensions (AdBlock, Privacy Badger etc.), or some cryptocurrency apps such as Geth or MetaMask, try disabling them. It is possible that some of these are clashing with Trezer Wallet.
Problem might be with the drivers. Try (re)installing the newest Trezer Bridge version from this source (once installed, please proceed by clearing your browser's cache). After successful installation, you should see "trezerd" process running in your activity/system/task monitor.