I would say: It’s almost impossible to brick this device.
A word of advice:
After tftp the firmware, wait 5 minutes instead of 1 minute. Then
wait 10 sec,
plug in power,
wait 20 sec.
You should be able to go to 192.168.1.1
If not working try different browser. Once everything is working,
unplug power again,
hold down wps button while plugging in power.
keep holding for 30 sec.
That will reset the nvram.