There are two reset procedures for X-Rite's DTP41; no software is required.
POWER UP RESET
This procedure resets the instrument to it's power-up defaults as last set by either the factory, or a third party package of software.
Plug in the instrument.
Press and hold the black measure button until it glows RED.
Release the button.
Press the button again (This must be done within ten seconds of step 3, or the instrument will return to the ready to measure mode, without resetting).
FULL FACTORY RESET - This will reset the instrument to the default settings for both measurement modes and communications.
Unplug the instrument from power.
Press and hold the black measure button.
While holding the button, plug the instrument back in. The light will turn RED.
Release the button. The light will turn green. The instrument is now returned to factory default settings.
Alternative Option. The Toolcrib software also allows the flexiblity to perform a reset as well which will return the device to a Factory Default status. Once the instrument is connected to the software simply click the Reset Option.