Are your routers in Auto mode? On the router there is a switch labeled "Auto/Off/On." In the auto position, the router will try to auto detect your ISP.
If the router switch is in the "On" position, it could still be stuck in "Auto-detect" and you can follow these steps to correct it:
If the device is stuck in autodetect mode, even when the switch is on, or it doesn't accept the default username and password after a reset, try these steps, they worked for me.
- Unplug the power. Set the switch to the Auto position.
- Power on the router, let it boot up. Reset it.
- Once the reset is complete, unplug the power again. Set the switch to the On position.
- Power on the router again. It should be back to normal.