“I am expanding my system to three phases. My existing device has the serial number HQ2247… and firmware version 508. How can I get two new MultiPlus-II 48/5000/70-50 units that are hardware-compatible (processor type) with this device?”
Hi. Have a read of the hardware compatibility ID section here: A decent supplier should know what to do. Please avoid the internet retailers..
Sell the one you have and buy 3 new ones from the same batch.
Thanks, that helps me.