Hi Tumas,

Do you use windows? If so, perhaps this troubleshooting page can help...https://doc.satoshilabs.com/trezor-user/troubleshooting.html#windows-os-trezor-wallet-doesn-t-recognize-trezor-after-update-to-firmware-1-4-0-or-higher

Also, try contacting trezor's support center: https://trezor.io/support/

Hope this helps