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The preceding HR2510 was and is a legend in the freeband/CB community. It was trivial to convert it to CB and was already programmed with the CB channels. The FCC required the manufacturer to make something more difficult to convert, hence the 2600.
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Really trivial - cutting a ground trace to one of the CPU pins.
The 2600 was opened up by changing out the CPU - the replacement was named ChipSwitch. It was a 64-pin device, with pins really close together; a test for soldering skills, and it was strongly suggested that a socket be installed instead of trying to do a straight replacement. It was worth it, though, as it really enhanced the usability of the radio, adding features not available with the stock CPU.
I have 2 of them, one with a ChipSwitch CPU, one bone stock; I also have a spare uninstalled ChipSwitch CPU tucked away somewhere along with a spare rotary encoder. Unfortunately the Chipswitch one needs attention...
Another common mod was replacing the final with an MRF497, which gained about 15 watts or so.