Upgrading an MICS to 7.1 XC I was told I have to upgrade my CP to Release 3.0 (I believe it is 2.1 now) Is it just a question of purchasing another flash card and if so will all my programming on the CP remain when I swap them out?
Is there a less expensive way also?

I know the compatibly sheet says 3.0 software for 7.1, but I have seen 2.1's working off 7.0 and it shows 3.0 as the software level to work with????

The upgrade is a flash card that goes into the top slot of the CP. All programming is retained, but the upgrade can take up to an hour to complete.

Do i upgrade the MICS first and then the CP150 or both at the same time

Upgrade the CP150 first, then the MICS.