[BUG] TG2472G during router login

Scenario:

in browser window type 192.168.0.1

prompted for username/pass

input credentials

received javascript error
interface refused login

investigation:

opened webconsole:

[Deprecation] Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/.
send @ jquery-1.9.0.min.js?ver=9.1.103DE2:3

Error occurred on line
Line 3806:
          if (n.username ? u.open(n.type, n.url, n.async, n.username, n.password) : u.open(n.type, n.url, n.async),


firmware update required to address deprecated functionality

Browsers Tested:
Chrome confirmed
Firefox confirmed
Internet Explorer confirmed