I believe that the chip in the Blumini is the Qualcomm CSR8675. Same chip that is used in the Ananda BT.

My mic wasn't bad with the original firmware but when they put out the new firmware to match the wired and blutooth audio levels, it effectively killed the microphone.

Only issue with Deva remains the latest Deva firmware has killed the bluetooth microphone. So if you don't need that, it's a good compromise.

Still no fix from hifiman for the super low volume on the blumini? This occurred after the update to fix the low volume when cabled. Anyone else experiencing this? Issue is that bluetooth microphone audio through bluemini is almost non existant after applying the 20200515 firmware. It's now...

I have also updated to the May firmware. It does increase the volume through USB which now gets as loud as bluetooth, BUT, it has also reduced the microphone volume to the point of it being useless now.