I'm not so sure that it's your bank angle sensor. Generally, this trips if you roll over, not from going up a steep dune. Going up steep things (dunes, hills) is something that quads regularly do and any sensor should not trip unless you get to a point of no return. If I remember correctly, that sensor is either tripped or not and once tripped, you need to right the quad, turn the key off, wait a couple seconds for the sensor to reset, turn the key back to on start the quad and go.
This happened a couple races ago with a friend on her 700xx... she rolled over on an off camber turn but could not get her quad to start again when back on her wheels. I came over, turned her key off and turned it back on after 2-3 seconds. Her quad started right back up. She didn't know about the bank angle sensor.
"You lock the door and throw away the key. There's someone in my head, but it's not me."
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