This is a software mod to open up the receiver for the IC-2GXAT.
 (YOU DO NOT NEED TO EVEN TAKE THE RADIO APART!)
 
  - Turn off the radio.
  
   - Press and hold the, F KEY, Scan and Dup keys.
  
   - While holding all 3 keys turn on the radio, continue to hold  the keys for about 3 seconds WAITING until the display returns to normal before releasing the keys.
  
I did this to my HT and it receives from 50Mhz – 204Mhz. 
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