Forgot B1-ham Pin; How to Reset Device?

I bought my daughter a B1-ham for her work with a local search and rescue group. We unboxed the device and allowed it to fully charge, inserted the SIM card and a micro SDHC card, and then started the B1-ham. We chose and entered a pin, and re-entered it for confirmation. We were interrupted by phone call and when we got back to the B1-ham it was off so we pressed the power button and after a few seconds we were asked to enter the pin. We entered the pin that we had written down but the pin would not unlock the device. I would greatly appreciate any advice about how to reset the B1-ham to its original factory settings just the way it was when we unboxed it. Many thanks.

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