@AnotherJeff,

For the Google OnHub line, TP-Link was only the hardware manufacturer of the device. All firmware, functionalities, and features were created and managed by Google, with only the hardware being provided by TP-Link. We did not even provide support for the device, as Google's support team handled everything related to the device.

Unfortunately, as you are finding out, Google has officially ended the support of its OnHub line of routers. You can read more in their official post:

Support for Google OnHub routers ending

This is outside the control of TP-Link, and I do not believe that we have any ability or plans to take over the devices. I would however recommend looking at other forums to see if there is an open-source or third-party firmware that has been released so that it can be managed through some sort of interface.