Thinking of getting a powerlogger for my wideband, but as I understand it, it requires an upgrade to 2.2 which is only possible from a TRUE 2.1 SM, not a 2.0 that's been upgraded to 2.1. So, while the SM displays 2.1 on boot, how do I tell if it is a 2.0 upgraded to 2.1 or a true 2.1?