How do I perform a factory hard reset on the DB3 module?

A hard reset will revert the flashed firmware back to its default factory settings, but this action resets certain installation configurations and may require reprogramming. To execute: Connect all harnesses except D2D (remove if installed), hold programming button while connecting the 14-pin harness and wait 3 seconds until LED turns solid orange. After 10 more seconds, when flashing orange-red, release the button—it will then flash red for resetting.

From the official Directed Db3 manual, page 18

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