opt 116 shows P401A6095A. I am trying to find out what version this is. KX-T77XX doesn't want to work with it so assume it's pre-3. To upgrade do I just need to swap the ROMs or does that require reprogramming everything?
Sorry, forgot, This is a KX-TD816.
Look at the sticker on bottom of unit. A number inside of a circle
tells sw version.
Should not matter as long as XDP is off on the port in question.
Unfortunately I'm a hour away from the site and forgot to check the label while I was on site. I was able to get their manager to pull the Rom number. Does anyone know what this crosses to? Also would a KX-T74XX have the same problem?
Have manager look at sticker.