Connex CX-33TLM3

Remove the 2 screws toward the front holding the upper board assembly. This allows lifting the board up slightly to access the CPU board.
Locate IC2 on the computer board and plug the small programming module into the socket next to IC2. The programming module can be found inside the radio's microphone box. Locate JP3 near IC2 and temporarily short the pins of JP3 while powering the radio on. This will cause the programming module to write the data into the CPU chip. After programming the radio, the module can be removed or left in place for future use.

Factory Programming = 28.015 - 28.465 Mhz in 6 bands
After Programming = 26.615 - 28.305 Mhz in 6 bands

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