52 volts?!? Ya that would kill it
First thing to look at is the polarity correct coming off the voltage adapter into the router?
Does it work with the wall plug?
Try to reset it and update the firmware.
That said. we had our new router fail about an hour into our testing and drivers training.
Lucky we we able to put last years router on to keep going.
We had to bag the robot with the old router on it.
After working with Dlink tech support our router was deemed defective. Great thing is that it is under warranty, provided you can supply the proof of purchase. Have a call into FIRST parts to get this resovled but no reply yet. I got an automated reply that they are out of the office till mid week.
Our router has two led (power and bridge) that come on briefly blue then they all shut off and the power led turns solid red. We can run the firmware update but it doesn't help.
Good luck, worse case, you can swap it out at your regional spare parts table.
Not sure of any of this helps, but I feel your pain.....