Look at section latest manual for the wireless expander section 5.3 is probably the best place to start.
unfortunately changing the expanders and updating the firmware can be problematic. The manual should be able to get you straight again. The allocation I was told had changed around somewhere between the versions and defaulting the wireless zones should allow you to relearn things back on. if it doesn't then manually go through zone setup wireless zones and do the learn and reset to each wireless zone to free up the space and then start again, learning back on.