I know that the APACS's ACM+ module with different ROM version can not be run in peer to peer mode. My customer have a quondam ACM+ module withe ROM version 3.01. and he want to deploy the peer to peer mode with a new ACM+ module,but the available ACM+ is only ROM version 4.00. How to do it? If the old ACM can be upgrade or the new ACM can be degrade by user?