Hey all,
Just to let everyone know and to close this one off I resolved the issue.
Originally I flashed both the Mellanox cx4 and the cisco variants with the same firmware for cards with PID MT_0370130002 using flint. After flashing all cards were are firmware verison 5.3. The Mellanox CX4's worked but the Ciscos did not.
TO resolve it I used mlxburn with default 5.3 firmware and used a slightly different config file (I wont go into detail around this) to generate the .bin firmware file.
I then flashed the cards with flint using the new firmware and the cards are working now
I've attached a link the firmware to this thread if anyone ever needs it .