PBXact Phone Apps - Failed to load XML file

whenever we try to press any of the buttons (like parking, apps, dnd, etc) on the S500 telephone we get “Failed to load XML file”.

This is happening when we are using an internal profile that points direct to the PBXact IP using the internal IP. There are no firewall policies that are blocking it as it’s internal. I have tried to enter the “fwconsole upgrade restapps” command as stated in this post however it doesn’t work and throws – [InvalidArgumentException]
Command “upgrade” is not defined. –

What version of PBXact at you on?

fwconsole ma upgrade restapps

PBX Firmware:10.13.66-20
PBX Service Pack:

Strange stuff is happening.

I did run “fwconsole ma upgrade restapps” however it didn’t seem to work after that. I just did a factory reset on the phone and now it’s working.

Also, the firmware for the S500 is but I just noticed a new version (S500 I will try that.