I disagree, I have an Astro Spectra (mid pwr W7) Hex editing the executable is indeed possible since I programmed mine out of band this way in CPS. For instance:
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Conventional out of band.
Same procedure as the XTS3000/Astro Saber CPS.
Hex edit the exe file. Replace each instance of 80A1031C with 0080841E
That will raise the upper band limit from 470.000 to 512.000.
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This is only an example, since you will need to calculate the hex from the corresponding 6 digit frequency.. i.e. 138000 or 403000, Hexworkshop does this very well and has a built in base converter so this can easily be accomplished. Its not the easiest of hacks, and you risk all sorts of undesirable things if its done incorrectly, but alas.. it can be done.