Long story short I've got an MD3220 with dual cards. After a power issues they went into lock down and I was able to get the controller in slot 0 back online through the serial shell. However, the controller in slot 1 is being shown as removed in MDSM even though the controller is in the unit. I can connect to the slot 1 controller with the serial cable but don't know where to go from there to try and revive it.

While I was waiting for the serial cable to arrive I acquired four used controllers and an enclosure. I'm not sure if I need to wipe those before trying to use them AND I'm confident they have firmware newer than my current controller in slot 0.

Advise?