I just managed to get myself to level 30 with CoSMOS 6.2!
So this is what you do: just start a new scan with an unknown value, with all types. Then go win a race, and scan for a value that has "increased in value", keep doing this until you have around 1000 adresses left, and then select them all and change the value to something like 1000000 or so, this should get you to level 30.
After that, just go upgrade/downgrade a car you have in "my vehicles" and then close the game. After that you should have a level 30 account where you can unlock all the cars.
This is also all the information I'm bothered to give out about how I achieved rank 30. So if you don't know where to get CoSMOS or don't know how to use it, that's not my problem, sorry.
Have fun, I hope this helped for those without the avx-trainer capability.
[Edited by jamaina, 6/4/2013 5:55:04 PM]
That does not work.
I know how to use CoSMOS very well and I cannot get what you have explained very loosely to work!