Great, so you do have the ZL1100P (I got mine over a year ago, but it was the ZL1100 only). I don’t think I’ve seen you review the unit yet? (would like to see your review…)
I think I understand what you meant by “old” firmware and “new” firmware. When I first got my ZL1100 (more than 1.5 years ago), it had the “old” firmware (different screen), but many functions were not working properly. Someone told me to try installing the “new”firmware , which finally made it work properly (screens are now different). Mine has the USB-C connector on the left (the model without PD triggering).