5. Make sure that the power is off on the meter.
6. Press and the hold the ESC key and the Range key
at the same time and then press the power button.
7. The boot loader screen will appear on the screen
after the initial splash screen appears. (Note: The
ESC and Range keys need to be held until the boot
loader screen appears.)
8. The unit is now ready for the DFU driver
installation or the slave microcontroller firmware
update.