The main reason of updates are not started is because the file structure in the µSD-card is not correct. See the guideline in the release notes. Beware of the ".tar" where sometimes a only folder is put on the card. SD card image update
Please also beware that there must not be a folder on your µSD-card with the serial number of the ctrlX CORE, because this would prevent an image to be installed. Also the bootloader and the "rescue.itb" have to fit to your image.
The correct procedure for doing an app update can be found in the actual release notes. In short first update deviceadmin and them all other apps.
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