MD3/MC42 multi master trouble

Hi everyone.

I have encountered a strange problem with a MD3/MC42 multi master system and cant't seem to resolve it "quickly".

The problem is that I cannot upload the software onto the system effectively. I have used MD3's and MC42's quite a lot in the past but never together like in this manner and this is the 1st time I encounter this issue (usually I have a MD3 with an expansion module or either a MC42 with a MD4 multi master system with no problems) so this time we wanted to use the MD3 and MC42 together for a project, so I thought it will be basically similar to using a MD4 with a MC42.

I have a 0T id tag on the MD3 and a 1T tag on the MC42, when trying to uplod the software via USB through the MD3 I get the message "incomplete system" and showing only the MD3(Safe mode). But the display also indicated wrong ID tag for some reason.

Then when disconnecting the 0T ID tag from the MD3 and try to upload the software, it works when I click yes after I get this message shown below, both controller get updated though, but then after uploading/startup a message appears on the display stating "CONTROLLER MC42 : NO CONTACT"

Does anyone have an idea what I am doing wrong and where? Am I reading the MD3 manual wrong or something? It states when using it in a single master system no ID tag is required (only a tag on the expansion module if present) but using a multi master system an id tag is required.

I have tested this on 2 different wiring looms also with other new controller modules, all with the same result. 

What am I missing here...?