Andrzej et all..

Turn off the flarm, plug in the USB stick, turn on the flarm, wait for
the display to go to the standard view (butterfly with gps and tx boxes)
- the update is done, pull out the USB go fly and have fun. No need to
watch the LED. If you want to verify the update was completed, turn off
the flarm, turn it back on and hit the display knob during boot up to
get flarm info. Installing the panel mounted USB extension makes life
even easier.

Don't let the tech drive you nuts, you will enjoy flying a lot more :-)

Luke