MS60 Bricked unable to TFTP firmware

I've had a satellite for awhile now, that has failed to join my mesh, on multiple occasions. Most recent occasion, it rebooted, and went to the infinite blinking light; indicating corrupted firmware.

Followed the instructions to TFTP the firmware, however, the ethernet adapter doesn't indicate a link to the interface.

Also looked into NMRPFlash, however, without a network interface, there's no way to flash it.

However, I did discover the serial interface on the main board. Does anyone happen to know the pinout for the serial header?

As of right now, I have ground connected to pin 1, TX connected to pin 2 and RX connected to pin 4.

Any ideas? I'm definitely past the validity of my warranty. Lol