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APM no longer connecting!?!?! PLEASE HELP!!!!

So I have an APM which I've been using with relative success for several months. Then I took it out of one airframe and decided to flash the newest firmware while I was at it. I don't know if it was the flashing that did it, but it's no longer connecting to my computer.

It is recognized as a USB device, and the port will open, but Mission Planner and APM Planner aren't receiving any data.
I can't reflash because neither program will recognize the existing firmware.
The yellow RX and TX LEDs on the board never blink.

Here's a vid of me attempting to connect so you can see what I'm talking about:

I have tried reinstalling drivers. Both APM Planner and Mission Planner. Rebooting. Holding down reset on the board.

SUPER frustrated right now! :mad: