Finally there's a way IQOO 13 owners can use LHDC 5.0 in their devices. 

It's not officially provided by IQOO yet (which they must), but it can be achieved using this app that is available on play store

BLUETOOTH CODEC CHANGER

here's the link▽

https://play.google.com/store/apps/details?id=com.amrg.bluetooth_codec_converter

Here's the proof it works and how to enable.