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Hold "func+L/O" a message should come up asking if I wanted to unlock all freqs, then press "E" for yes...
Input several freqs in an unused bank and press L/O a couple times and then press "Unlock+E" (as per above) should unlock all the frequencies / channels.
reference - http://info.uniden.com/UnidenMan4/BC125AT
Press HOLD again and can press .CLR to return to the previous screen. May then push Srch to rescan.
If is not responding may reset to factory by following steps on page 37 of the manual - http://info.uniden.com/twiki/pub/UnidenMan4/BC125AT/BC125AT.pdf