I called comcast on monday to try and get my internet. However do not confuse the blinking with the firmware update process where blinking of light appears too because the wifi unavailability usds blinking is entirely different than the firmware updating one.

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Comcast modem us ds flashing. Unplug the power from your internet router. Could very well be a faulty modem if it is trying and failing to do an update. Select the modem or router which you are using. Check if the xfinity internet connectivity usds light blinking issue is resolved or it still persists. Therefore when you encounter the usds light blinking issue make sure you try restarting your router. Plug the power back in and wait for internet services to start.
Normally the light is solid when theres a lock and blinks when there is a problem or it is searching for a lock. After a 2hr chat with xfinity cs i decide to take the modem into an xfinity store for a swap. Press and hold the power button on your internet router. Plugging the power back in. Select restart this device. If its one of the gateway devices which it sounds like it is if the online light is on but usds is flashing the modem is attempting a firmware update.
Coming towards the xfinity wifi router it is a trading term for the comcast cable communications a giant isp in the region of the us. Check to see if the issue. Usds light blinking on brand new modem. Signal is being sent to my location but the modem wasnt parsing it i guess. It may take up to seven minutes to restart your xfinity internet router or modem. If restarting your router doesnt help you to fix the usds light blinking on your modem issue then i suggest you check your modem.
Method 2 check your modem. It is quite obvious electronic items often get defective with time. Yesterday afternoon my internet stopped working. Unplugging from the socket.