Mbox Pro 3: Hardware Not Connected

[hoolij]

Hi there,
My setup is as follows:

Computer: iMac 3 GHz Intel Core i5
OS: Mojave 10.14.5.
Interface: Mbox Pro 3, Driver version: 1.3.6, Firmware: 1.04

Connection as follows (2 adapters):
[Thunderbolt 3 Port] > [Thunderbolt 3 - Thunderbolt 2 Adapter] > [Thunderbolt 2 to Firewire adapter] > [Firewire Adapter - Mbox Firewire port]

So the basic problem is that I'm getting the "Hardware Not Connected" issue and the iMac is not recognizing the Mbox in Audio Devices. Despite the complicated connection with 2 adapters, I have confirmed in System Report/Hardware that the Mbox IS recognized (see below). However it is not showing up under Audio Devices and is not streaming. I have tried reinstalling the 1.3.6 driver package but no change.

The Mbox unit seems fine.
Any idea how I can resolve this issue?


Thanks for your help.

John





Mbox Pro:
Manufacturer: Avid
Model: 0x4
GUID: 0xA07E0401000000
Maximum Speed: Up to 400 Mb/sec
Connection Speed: Up to 400 Mb/sec
Sub-units:
Mbox Pro Unit:
Unit Software Version: 0x1
Unit Spec ID: 0xA07E