Model No: UH038SX/UH038SX-NB
Turn the unit off, Press and hold “SCAN” & “MON” buttons together at the same time and turn
the power back on. After 15 seconds turn power back off then on
Model No: UH039
Turn the unit off, Press and hold “[mon] and [vol▲]” buttons together at the same time and turn
the power back on. After 15 seconds turn power back off then turn on
Model No: UH040XR
Turn the unit off, Press and hold “SCAN” & “DUP” buttons together at the same time and turn
the power back on. After 15 seconds turn power back off then on
Model No: UH041
Turn the unit off, Press and hold “[mon] and [vol▲]” buttons together at the same time and turn
the power back on. After 15 seconds turn power back off then on
Model No: UH042XR
Turn the unit off, Press and hold “SCAN” & “DUP” buttons together at the same time and turn
the power back on. After 15 seconds turn power back off then on
Model No: UH043SX/UH043SX-NB
Turn the unit off, Press and hold “SCAN” & “MON” buttons together at the same time and turn
the power back on. After 15 seconds turn power back off then on
Model No: UH044XR
Turn the unit off, Press and hold “SCAN” & “DUP” buttons together at the same time and turn
the power back on. After 15 seconds turn power back off then on
Model No: UH044SX
Turn the unit off, Press and hold “SCAN” & “CALL” buttons together at the same time and turn
the power back on. After 15 seconds turn power back off then on
Model No: UH047
Turn the unit off, Press and hold “SCAN” & “MON” buttons together at the same time and turn
the power back on. After 15 seconds turn power back off then on
