Ok I have some info on SDCards for those of you struggling to get it to work.
You can partition / format a normal SDCard and follow M3Evolutions intructions no problems to update the Dynavin Android side with the new ROM.
Where most of the issues come is when you go to use that same SDCard / format with the OS. A lot of cards weather you format them with 64k sector sizes dont work.
I was very lucky and got my 32gb card working with out an issue.
You can get an SDCard to work if you format it with something like a camera or gopro. Then insert into Dynavin and let the system fully boot.
Youll notice after Android has started it will write to the SDCard. When you read it and try to copy files in a PC and try to use the card again in the Dynavin it will come up as corrupted or just not even have a message at all.
I fixed this by switching brands of card on a friends car today and it worked fine.