The method sydinstaller mentions works.
Once you have put the NevoSL into 'Low Level Format' you need to
1. Turn the NevoSL off then HOLD the HOME button while turning the NevoSL back
ON - KEEP HOLDING HOME until you see 'USB Download' mode
2. Connect the NevoSL to your PC using the cord included with NevoSL
3. Open NevoStudio and go to Tools\NevoSL Device Update Utility
and re-load the firmware.
4. Be sure to choose the option to 'Download a project file'
5. Patience! Some of the sections of the firmware update take longer
than others.
6. When doing the calibration - when it starts the 'countdown' tap anywhere on
the screen.
7. Set the DATE and TIME - hit 'APPLY' before you hit OK.
8. You will need to re-enter some of the wi-fi settings (encryption) into NevoSL.
9. ALWAYS reset the NevoSl after you make changes to it or to the network
enviroment it is working on (because it is Windows CE).
10. ENJOY your NevoSL!