Hi,@KrispPL 
Thank you for posting here.

ES210X-M2 natively supports the Cable Test function. You are most likely referring to the Cable Test function available in the Switch's web UI. This is a native built-in feature of our Switch, and it carries no hardware or software version restrictions.

The incompatibility issue you encountered after your switch was adopted to Omada V6 actually corresponds to the Cable Test function under the Network Tool section of the Omada Controller. This is a newly launched Controller-exclusive feature. While it shares the same name and core functionality with the native Cable Test function pre-installed on the Switch, the two features are independent of each other. As a newly released feature, it requires that your device runs firmware that is fully compatible with Controller V6 or V6.2.

If your device does not support this feature for the time being, please kindly wait for the official firmware update that will add official compatibility with Omada Controller V6.2.