Burn the official example provided by the TuyaOS Bluetooth LE SDK. For detailed steps, refer to TuyaOS Quick Start.
Check if the development board is working properly, for example, if there is an external low-frequency crystal oscillator. For the requirements of development boards corresponding to different chips, refer to Development Platform.
Confirm the version of the Tuya Smart App, and whether this App is the official version downloaded from the official store.