For this I'd be calling (phone, not email!) Panasonic to find what they may have laying around for this.
I have Panasonic KX-TEA308 PBX device and I also have KX-TE Maintenance console V3 programming software installed on my computer.
I want to connect the PBX to my computer to program it using the software, but an error appears says "Cannot connect with the PBX of this firmware version or Model Type".
I think the problem is that the firmware of the PBX is old and the software cannot handle this old version of firmware.
So, I need either to have an older version of KX-TE Maintenance console software, or a way to upload a new firmware version to the PBX.
I'm looking for an older version of the software, like Version2 for example.
If someone can help me on this I will be very grateful.
Thank you very much.