XML Parsing Error when attempting login via web browser

[pcunite]

When attempting to login to a DECT Base W60B, via any version browser (IE11, Edge, Chrome, Firefox, etc.), upon pressing the Login button, the silent error below (shown only in browser debugger window) gets generated.

Visibly, nothing happens. There is no way to login now.

Current Firmware: W60B-77.81.0.10.rom

Code:

XML Parsing Error: syntax error
Location: https://192.168.0.1/servlet?p=login&q=getsessionid&Rajax=0.5747523322867499
Line Number 1, Column 1: servlet:1:1

TypeError: document.cookie.match(...) is null[Learn More] servlet:75:12
    ajaxSucceedCallBack https://192.168.0.1/servlet:75:12
    Ajax/this.send/c.onreadystatechange https://192.168.0.1/js/ajax.js:1:717

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Here is another output:

Code:

favicon.js:6
Uncaught (in promise) Error: unable to load image at Image.img.onerror (favicon.js:6)

servlet?p=login&q=loginForm&jumpto=status:75
Uncaught TypeError: Cannot read property '1' of null at ajaxSucceedCallBack (servlet?p=login&q=loginForm&jumpto=status:75)
at XMLHttpRequest.c.onreadystatechange (ajax.js?77.81.0.10:1)