It is recommended to check the web site periodically for updates. The latest firmware for VBOX LapTimer can be found here.
To perform an upgrade simply place the .upgrade file on the root directory of an SD card, insert the card into the VBOX LapTimer when it is turned off, hold down the top arrow and then apply power.
Doing so will put VBOX LapTimer into an upgrader mode, the progress of the upgrade is indicated on the screen.
When this has completed remove and reapply power to complete the upgrade.