on the bottom of cpu board there are 3 v.24 ports and a black connector with two holes and a led. Short circuit the holes on the black connector (mostly there is a special jumper for it and its connected to this connector from one of its legs) and restart your system. After restart your BP will turn to factory defaults, extensions from 200 and trunks from 700. Do not forget to plug out the short circuit after restart.
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