Thank you to everyone who has contributed to this thread.
Before I follow the steps just one question comes to mind.
Can I clone the sd card either using Windows or Linux before altering it?
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You can only fully clone it with Linux / Ubunto etc. I would not bother. Just take a normal directory copy of it, the CID is out of range of normal file management procedures so you won't delete it or corrupt it, it stays put. More chance of that using Linux / Ubunto copy and write CID tools which are on the net. Only specific old SD cards allow you to write the CID in anycase but probably the card in the car is one of those.
It is important to copy the normal contents of the card since you need one file off it, which you need to keep in a safe place. Thats your back up. CID doesn't get copied. If you loose the original overall.nds file you have to down load the exact copy of what is currently on the serial release of the card. Only twice on the thread have people got in a pickle on the mib2 standard by either not taking a copy or loosing the backup.