What is 2.0, 3.0, 3.1, 4rd iteration? I'm n00b
1.0 is the first iteration.
2.0 is the ejectable card design PCB.
3.0 is the more flashcard/gamecard like one, however it suffers from a flaw with the glue, causes contacts to corrode and not connect.
3.1 is the revised version of the 3.0, it's got the same design but with red letters on the cart.