If you wish to use the offset calibration or crosstalk calibration functions of the regular MappyDot (not Plus) you will need to upgrade to the 1.5 firmware release, as there is a bug that prevents the calibration data from being loaded.
There is a firmware update guide available now which walks through the update process:
If you are running an older version, it's worthwhile to upgrade as there are a bunch of new features such as:
- Auto address recovery.
- Custom measurement mode profiles.
- Soft interrupt command.
- AmbientRateRtnMegaCps and SignalRateRtnMegaCps commands.
- Tweaks to filtering.
- And lots of minor bug fixes.