Hello!
Thank you very much for your participation!
Sure,
- When changing devices for the same system, nothing changes: device B is working incorrectly, while device A is working correctly.
- We are using Audacity, Ubuntu 22.04, and we can modify the environment as needed.
- Can you tell us where to find other firmware for the device? Previously, we only used 6_channels_firmware.bin via dfu.py script.
- the same question, see 3
- Sent the information, we are in touch and waiting for the completion of testing on their side.
- Ok
- Ok
What exactly are you expecting to see? We connect the device in USB to PC format, with the Digital Stereo (EIC958) Output + Multichannel Input profile.
Thank you so much for your response. Could you please help us with questions 3 and 4? 
Thank you! 