There is no firmware information available for the 851A as the current version is the original. April 03, 2024 10:24 Related articles What is the latest firmware version for the 851N? Azur 751BD User Manual, IR Codes & Technical Specifications Azur 851A User Manual What’s the best way to connect my 851N to my 851A? Why do I have to turn the volume control on my 851A up past halfway to get the volume level I want. Is this normal?