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I work very much with GM350s but I do not know someone who did it; I wouldn't give you much hope
I would be happy if I could use all 16 chans from the 4ch model (GM350A2). I only found a way to put a 5th chan...
You may be able to do it in the same manner as an MCX-1000 or a Syntorx9000, by changing the eeprom in the radio, but you would have to find a part nymber for it.