Hello. I just purchased a BTA30 Pro, which arrived today. I reviewed the instructions, connected the unit to my Windows 10 PC via USB, and powered the unit on. The white USB light illuminated. Initially, the status light was a solid red. I switched the unit to TX mode and attempted to enter pairing mode by pressing the C button for several seconds, but nothing happened; the white USB light and red status light remained unchanged. I repeated the step with the D button; again, nothing happened. I tried to power down the unit by holding the C button for more than five seconds. Nothing happened. I attempted a reset by holding both the C and D buttons at the same time for more than five seconds. Again, nothing happened. I repeated all steps using a different USB cable and port on my PC, switching between USB 2.0 and 3.0. This made no difference, although sometimes the status light would be a solid blue instead of red after powering on. I couldn't determine the cause of the color change, and it had no effect on the functionality of the unit.
I checked the output source both in Foobar2000 and JRiver. Both players recognize the BTA, and they will play music files outputting to the device. Since I can't pair a Bluetooth device with the BTA, I switched the unit to DAC mode and connected its RCA outputs to my Asgard to see if any sound signal is coming through (I was sure to adjust the BTA's volume knob). I got nothing.
Aside from the fact the BTA turns on and my PC's players recognize it, the unit has zero practical functionality at this point. I'm thinking I've got a brick that needs to be returned for a replacement, but I thought I'd check here first to see if there is something I'm missing. I looked over the Quick Start guide, as well as the FAQs on the FIIO website, but nothing addresses the problem I'm having. Any help is appreciated. Thanks.