When you connect your Redmi Buds 3 to the phone, it will adapt to the best matching decoding mode automatically, and it cannot be set manually, even in Developer options.
For your reference, here are some common decoding modes or audio codecs:
1. SBC (Subband Coding) is the default and mandatory codec for all Bluetooth devices. It offers basic audio quality and is widely supported across devices;
2. AAC (Advanced Audio Coding) is a codec known for its higher audio quality compared to SBC;
3. aptX/aptX Adaptive refers to Qualcomm's aptX codec series, which provides higher audio quality with low latency, enhancing the listening experience.
