MCU Boot Loader Troubleshooting

When MCU firmware load is interrupted, or the power-on firmware checksum test fails, the KX3 enters its bootstrap loader. You can also force the KX3 to enter its bootstrap loader by turning the KX3 on with a 10-second press and hold of the two POWER buttons (BAND- and ATU Tune). The MCU boot loader displays MCU LD on the KX3 front panel display. The display may not be backlit.

To load KX3 firmware, follow these steps in sequence: