I'd definitely contact their support at support@66audio.com. They should be able to send you a firmware to enable aptX-LL. Here's what they sent me, might even work on your unit. Here's an update from our team! Please click this link: https://www.dropbox.com/s/xqspc65hb2lcyas/BTS_Pro_6_9_5_LL.exe?dl=0 1. Connect headphones to a PC 2. Hold "<<" "66" and ">>” buttons until the LEDs turn off 3. Run the update, press y This should enable aptX LL on your unit.