Can no longer access my Lorawan Gateway

I have a DfRobot Lorawan Gateway. Initially I was able to access the gateway configuration using the 10.6.6.6 ip address. Then eventually I could not.

I performed a factory reset on the gateway by holding down the RST button for 10 seconds and let the unit reboot and I still cannot access the unit.

Is it bricked? Is there a way to reflash the firmware?

Thanks in advance.