There is no firmware information available for the 851A as the current version is the original. April 03, 2024 10:24 Related articles Azur 751BD User Manual, IR Codes & Technical Specifications What’s the best way to connect my 851N to my 851A? What is the latest firmware version for the 851N? Azur 851A User Manual Why does CAP5 protection keep activating on my 851A when I turn the volume up?