Hold down the program buttons and then press the power button to turn on the RD. It should very briefly display the firmware version and then display "RESET".
Note that apparently Belscort no longer is updating the displayed firmware version number whenever they release a newer firmware. For example, Escort quietly introduced a firmware update for the 9500i which greatly improved its sensitivity, yet the displayed firmware number didn't change. So don't be surprised if the displayed firmware version has remained the same. Belscort's service department staff seems to be very conscientious -- if the service card says they did something then I am sure that they did.

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