Try this, hope it helps
http://www.falconsekido.com/blogs/news/tagged/software
To Calibrate:

Make sure your sensor cable is connected and it is in good working order (they go bad sometimes)
Make sure your motor's sensor board is not bad (they go bad sometimes as well)

Start with everything off, then follow the steps.

1. Turn the radio on.
2. Make sure that your radio settings are at neutral/default (throttle trim = 0, brake trim = 0, etc.)
3. Connect the ESC to the battery - Do not turn it on yet.
4. While holding the switch button down, turn on the ESC and keep holding the button down until the ESC starts beeping (about 3-5 seconds) - which tells you it's in calibration mode.
5. Once it starts beeping, let go of the button.
6. Leave your throttle at neutral - then hit the button once (you should hear 1 beep).
7. Hold the throttle to Full - then hit the button once (you should hear 2 beeps).
8. Hold the throttle to Full Brake - then hit the button once (you should hear 3 beeps)
9. It should now be calibrated.

If this does not work .. try reversing the throttle signal on your radio and repeat the calibration process.

Troubleshoot log contributed by Joey Krysinski
(Updated Dec 2013)