Please Help! What's happened to my balance on Trezor wallet?

Cant see my Bitcoin on my Trezor wallet. After several months I logged in and the balance was zero. I then updated the fireware. It still will not show my Bitcoin or Etheruem balance. Is is zero. What has happened can someone please explain to me.

I have not been prompted to enter my seed phrase. Actually no passphrase was there.
Many Thanks