The OTA function is only available for devices after January 2021. The previous devices did not include OTA files, so it cannot be used.

First of all, set the desired effect for the device that needs to be set up the scene, such as color temperature and brightness, then enter the scene, long press to edit, then select the device, and then save it. After saving, the device will save the current working mode. Any operation after that (such as turning off the light), click on the scene to return to the current working mode (if it successfully returns to the set brightness and color temperature, it means that the scene setting is successful, otherwise it fails and needs to be reset).