I have two Victron multplus 2 (12v 3000va ) one is 120v out and the other is 120x2 out

I am attempting to set up a split phase system in an rv using both inverters with same firmware update. I am getting error code 25 incompatible firmware versions. Is there a workaround or do I need exactly the same models? they seem so close… Same output ratting just different transfer pass thru

peripheral equipment Mk3 interface, cerbo GX , GX 50, solar charge controller 150/100, 1600 w solar and 600 ah Li bank
Thank you in advance.

Yes they have to be the same exact model, and preferably within a year of each other. The only exception to the rule is combining a GX unit with a non GX unit.

Thank You