Try 10400 baud rate and lmk how it goes. My ECU is 10400 and while my M73 D14 cluster talks 9600 I believe older clusters may talk 10400. Not that anyone cares but 10400 is a virtually unheard of baud rate and its incomprehensible to me that it was chosen for any reason other than to make the tools and access to these clusters as proprietary as possible. "Right to repair" anyone?
I also noticed the "untested cluster version" warning which I have not seen before. I ran kw1281test on a M73 D14 cluster without that warning and pretty sure the "D14" is a later version than yours. My M73 D14 has a 2015 date of manufacture and my original with a 2002 date of manufacture is a M73 D01.
They should just have it wireless/bluetooth network. All this OBD adapters is nothing but a waste of plastic. And it seems like the only people making money from it is China lol.
I have the cluster hooked directly on the bench using K-Line. it didn't like 10400 baud. From the literature I've read in the past I think it's meant to be autobaud. Meaning what ever the program sends it with the 5 bit baud initialize, it should respond with the specified baud from the pc program itself. I may need to read that again. But who does 5 bits per second also? That's so dumb, but then again if you're going to fool emissions then you probably don't want anyone accessing your secret smoke you to death machine. I tried two clusters, my own one 2003 and a 2002 cluster. Maybe the ECU needs to be in circuit is the difference, I guess I could put an ECU on the K-Line. The read eeprom thing looked like it worked, but it's all zeros. This may take a while to figure out. I'm probably going to end up pulling the code from the ECU. All I want is the code right now, but after thinking about how my cluster may just die at some point I may need to revisit this. Are you able to read what numbers are on the chips in yours? There is two motorollas in mine, but they are not real clear.