Not sure if this would help, but won't hurt to try..
Connect to the Web UI
Connect the Phone and a PC to the network
Check the IP address of the phone using a handset.
Enable the phone's Web UI using a handset
[Menu]->[IP Service]->[Network Setti
Enter the IP address in a PC's Web Browser.
example: Enter "http://192.168.1.68"
in the address bar of Internet
Enter Authentication ID and password
Now you can upload new Firmware
into the phone using Web browser.
Note: The phone's http server port will automatically close after idle time of 30
Move to Maintenance - Re
set to Defaults screen.
Click [ Reset to Factory Defaults ]
The Base unit will reboot automatically
If you need further help, I’m available over the phone at https://www.6ya.com/expert/william_02fc2766c1e13b73