Download json file from "Mistel Support - AIRONE PRO JIS".
1. Open the VIA APP or VIA online. Turn on "Show Design tab" on "SETTINGS" tab.
2. Click on "Design" tab.
3. Drag the JSON file into the “Design” tab on the VIA.
4. A window will pop out after you drag the JSON file, please click on your keyboard model and then click on "Connect".
5. VIA should pair together with the keyboard now.