All you have to do is power the equipment off, install the USB key near the back right, then power the equipment back on. The functionality should be there, if you were scanning/printing before with the trail period there is no need to change any codes/settings. 673 is only for the trail period, once it has been used (e.g. once you put in a number of days up to 60) it can not be used again... afaik. You do not have to use 673 in conjunction with an enabler.
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