I followed the instructions in the installation guide from 08.9.3.80, unfortunately without success. The display says: "Software Update Verifying Firmware No Snom Fw. Update Error: 98". After pressing a button, the phone restarts and everything is the same. I also tried “https” instead of “http”. Current FW version: snom720-SIP 8.7.3.17. Autoprovisioning via Placetel UI doesn't work either. Can anyone help?