Batboard

Hello, Forgive me if this is the wrong area, but this is what my question basically pertains too.
I have an MTS2000 UHF (403-470) Firmware of 06.53 and is BN model. I know this radio will work with CPS 2.03 (latest.)
I just bought an MTS2000 VHF Firmware of 6.40 and is a AN model. Is it true that this is a 256k controller, and will not work with CPS?
What are the major differences between AN and BN?

Thank you very much!

update....stand down, it was a misunderstanding. I did indeed order a H01KDF9PW1BN....however the firmware is 05.44 time to see if it will actually work with CPS 2.03