Which Wi-Fi versions are compatible with the Cook-Key®? The Cook-Key® works with best using a 2G (2.4 GHz connection) instead of a 5G (5 GHz Connection) as it is not compatible. Related articles How do I connect my Thermomix to the Internet? Can I use a voucher at the same time as my in-App subscription? My TM5 is showing an error code, what does this mean? What if the scale in a TM5 or TM6 is not working properly? (This could be the scale jumping from 0 to max, the weight fluctuating without additional ingredients, or the weight amount doesn’t seem right.)