Have you tried this. If you accidentally load an old or incompatible firmware version and find the KX3 unresponsive, do the following: (1) Unplug the KX3 from the power supply. If internal batteries are installed, also remove one battery. (2) Plug a power supply in (or reinstall the removed battery). (3) hold the KX3’s BAND- and ATU TUNE together for about 10 seconds, after which you’ll see the TX LED flash (you’ll also see MCU LD on the LCD). (4) Connect the KX3 to a computer and run KX3 Utility, which will load new firmware.
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