MP1502 upgrade from EP1502

We are upgrading some of our access control panels. The panels currently have EP1502 master controller and a combination of MR52, MR52-S3's. We installed the EP1502 with dip switch 4 on to have it report as a LP1502 while we complete the necessary software upgrades and everything went smoothly until we noticed two of the MR52's did not come back online.

No matter what we attempted we could not get those two boars to properly communicate. We would just see the log in dnaFusion that said "Off-Line: Timeout (No/Bad Response From Unit) for those specific SIO's. The SIO's that did come up worked without a problem.

Anybody else experience this is there a solution or any tips on what to do?