I fried a NanoStation M2 with 48V poe and fixed it.

If you mistakenly did this and get the quick flash power light, here is your fix.

https://community.ubnt.com/t5/airMAX-Installation/Nanostation-M2-fried-with-48V/td-p/1178844

According to the community, just pry out this diode. No more over voltage protection!

Here is the diode next to the Main port.

After removal with a small screwdriver.

The unit is now working again!!!