The Updates will keep all data and settings on the device.
DT-X400 all model
DTX400OS4004.zip (Full image is about 1.25GB size)
If you need older Versions for reason of application compatibility, please conact our support team.
CAUTION: Please disable the screen security pin before operating the update. In some case the device get locked after OS update and it is not possible to access the home screen. After successfull update we you can set the screen pin again.