[CA] [CA11] Software(System) Updating Advice

[WittsEndIII]

We got our hands on an A77 MFD that had a 6pin female (spur?) cable spliced into the cable that connects to the display. The connector then fits into the white (center) spaces on the backbone. However, the MFD wouldn't communicate with the other devices, nor would the P70R see the A77.

I've attached a picture of the backbone:
(1) : Termination Plug
(2) : Cable for the EV-1
(3) : Cable for the ACU-200
(4) : Goes to a switch on the console to toggle the power to the System
(5) : Connects to the P70R via a T connector/adapter with another Termination Plug

Per the instructions you gave previously (provided I understood them correctly) I unplugged the ACU cable from the backbone and plugged in the MFD into the vacated port and then powered on the system. The MFD was running a v14.x software. It wouldn't show the P70R or the EV-1 in the Devices screen, nor would the P70R show the A77 (the P70R did still show the EV-1). I even plugged the MFD into the extra white port on the back of the P70R to have everything hooked up and it didn't connect to the other devices.

So I then made a call to Tech Support. Ran through some things with the gentleman on the phone, ultimately suggested to update the MFD software to v19 as it helps fix some communication issues. So I did that this morning; I was able to successfully update the MFD software to v19, however still no communication with the rest of the devices.

Do you have any thoughts/suggestions? Thanks in advance and have a wonderful day!