This is from UHF CB Australia site.
Unlocking the Uniden UH076SX-NB UHF CB radio
Turn on the power by turning the power knob clockwise
Press the channel up button until it reads channel 39 and wait 3 seconds
Turn the power off by turning the power knob anti-clockwise and wait 4 seconds
While holding down the (TXP) & (MON) buttons, Turn the power knob clockwise to turn the power on
Check the channel range to see if channels 41 to 80 appear
If channels 41 to 80 fail to appear repeat steps 1-5
Unlocking the Uniden UH710SX-NB / UH720SX-NB UHF CB radios
Turn on the power by turning the power knob clockwise
Press the channel up button until it reads channel 39 and wait 3 seconds
Turn the power off by turning the power knob anti-clockwise and wait 4 seconds
While holding down the (TXP) & (SCAN) buttons, Turn the power knob clockwise to turn the power on
Check the channel range to see if channels 41 to 80 appear
If channels 41 to 80 fail to appear repeat steps 1-5
Icom 400Pro UHF CB radio
The Icom 400Pro is 80 Channel Upgradeable however you will need the programming software and programming lead
(Please do not ask for software as we do not distribute any software)
I would like to thank to Justin (VK1FXJC) for making the file available to everyone
Download Job File Here
Unlocking the Uniden UH7760NB UHF CB radio
View & Comment on this video on YouTube
Unlocking the Uniden UH078SX-NB UHF CB radio
Turn on the power by turning the power knob clockwise
Press the channel up button until it reads channel 39 and wait 3 seconds
Turn the power off by turning the power knob anti-clockwise and wait 4 seconds
While holding down the (TXP) & (CALL) buttons, Turn the power knob clockwise to turn the power on
Check the channel range to see if channels 41 to 80 appear
If channels 41 to 80 fail to appear repeat steps 1-5
Unlocking GME UHF CB radios
Dealer Upgradable Radios
The following models of radio are dealer upgradable when containing the correct serial number prefix
Radio Model Number
TX3200, TX3420, TX3440
Serial Number Prefix
012, 101, 102, 103, 104, 105
User Upgradable Radios
The following Models of radio are user upgradable when containing the correct serial number prefix
Radio Model Number
TX3100, TX3340, TX3500, TX3510, TX3520, TX3540, TX4400, TX4600*
Serial Number Prefix
012, 101, 102*, 103*, 104*, 105*, 106*
*Serial number prefixes apply to the TX4600 only
GME UHF CB user upgrade instructions
Select Channel 7
Switch the radio 'Off' then 'ON' again
Select Channel 23
Switch the radio 'Off' then 'ON' again
Select Channel 39
Switch the radio 'Off' then 'ON' again
Select Channel 15
Switch the radio 'Off' then 'ON' again
Select Channel 31
Switch the radio 'Off' then 'ON' again
Unit should display channel 80 if successful, if unsuccessful try again from step one
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RA.