I bought the samsung S21 smartphone 2yrs ago because it had Bluetooth 5.2 with Audio Codec LC3 which improved audio quality. After waiting for two years for an FM transmitter that supported 5.2 it finally was available on Amazon. After looking at the smartphone settings to make sure the bluetooth is transmiting the LC3 Audio Codec. I find out that the Android 12 operating system does not support LC3 audio on my smartphone. I need to upgrade it to Android 13, but it's still not available for Samsung S21 in the USA until another month. I can't believe it took Samsung two years to develop an operating system to support the 5.2 bluetooth it came with my samsung S21 smartphone.