I see where I can assign a template to a NEW phone, but once the phone is assigned, I don't see anywhere that I can change the template...unless I need to manually copy and paste the config XML from the template file?!
Yup, I had a heck of time with the MACs too... Thankfully my 3cx install is in a VM, and I had a pre-upgrade snapshot.... I just reverted and grabbed the MACs from there