Ensure the PCB antenna is clear of obstructions and check for cold solder joints on the VCC pins.
Try loading the file into a generic Gerber viewer or software like Altium Designer , KiCad , or Autodesk Eagle. Bk-m33-bt-v2.pcb
The represents a maturation of the Beken SoC platform. By fixing the ground bounce, correcting the RF impedance, and optimizing the power sequencing, v2 transforms an average Bluetooth module into a production-ready platform suitable for medical sensors, beacons, and mesh lighting networks. Ensure the PCB antenna is clear of obstructions
Power input. Ensure you do not reverse polarity, as these small modules rarely have protection diodes. correcting the RF impedance
Check the power supply. If the voltage is too low (below 3.3V), the Bluetooth chip may not initialize.