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This little app (Screen Calibrate.exe) forces the screen calibration utility to appear...
When it is active Windows CE is paused in the background, so no reboots from 3rd party software by lazy programmers.
From the success in getting the factory screen to appear (albeit briefly) means the card slot is available to the system...
The problem is how to run it on your device, sometimes 2577\Autorun.exe on the SD card works, as does creating a text file called SHELL.ini containing the path to the exefile, (\SDMMC\Screen Calibrate.exe) or it could be unique to the device, or there may not be one at all.