I have a customer piece in for calibration that has been secured, and I'm trying to bypass the security using the procedure outlined in the manual, but it doesn't seem to work. The manual says to take the case of and short the two metal pads marked "cal unlock" on the bottom side, then enter "any security code" and voila! you're unlocked and ready to enter a new code as needed. The unit I'm working on, however, says "no match" just like it does without jumping the cal unlock and it remains secured against calibration. Any help appreciated.