Arducopter\Pixhawk hardfault on bootup (custom firmware)

@nbrakeES wrote:

I uploaded a customized version of the ArduCopter 3.5.0 code and am getting a hard fault during boot-up that prevents me from connecting through the USB to flash a different firmware.

Here's what I'm seeing
1. Plug pixhawk into computer using USB
2. FMU pwr - solid green, FMU B/E - flashing orange
3. Windows device manager recognizes newly attached COM 3
4. COM 3 disappears from windows device manager AND FMU B/E - SOLID orange

When I connect to the pixhawk using the FTDI cable to the Serial 4/5 interface I observe the same behavior and the PX4\PIXHAWK terminal in Mission Planner reports the following:

SeAssertion failed at file:armv7-m/up hardfault.c line: 184 task: init
...[additional error information]

How do I get the pixhawk reset so I can flash different software to it? (I'm under a bit of a time crunch on my contract so any help is GREATLY appreciated)

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