Hi We are doing an 412 to IP500 V2 upgrade for a customer who has very old modules and we have checked the documentation and serial numbers and the max we can go to is V9.0. In the office we have a new IP500 and SD card but when i boot it up its on V10 software so I need to downgrade it. Can i just reformat the SD card to V9 and simply get an V9 essential license? or is there another way?