I need help here , I need to order HMI 2711P-RDT12H SER A but its not available with AB Authorized distributer , he offered to supply Ser B and he confirm the old application of existing SER A can working directly with No any transfer tool or modification in configuration , he explain the SER B can downgrade to SER A but my concern the Old application can't
work in SER B without passing through reconfigure tools in FTV ME , What's your thoughts for that? 
