I went through the reset procedure without any success.
Plugging in my PC to the LAN port, I was unable to obtain an IP address.
I finally setup my PC on a static address (192.168.10.124), then I opened my browser and entered the ATA address of 192.168.10.1.
I then received a message that I needed to upgrade the Firmware and it offered the upload (browse) feature.
Of course, I didn't have the firmware downloaded, so I had to put my PC back on my regular router and go download the firmware. Then put my PC back on the LAN port of the ATA at which time I was able to upload the new firmware and upgrade the ATA.
After that, everything is good again. Immediately accessible and able to configure.
Hope this helps others with the flashing green / red lights