I have the 15.6" Touch Display and it works with Android 4.3 - not with multitouch, but it works.
Now i want to test the new Udoobuntu.
I have tested Multitouch with Andriod 4.3 and 15.6" Udoo Touchscreen here:
It counts 1 touch...
The Implementation of SATA to the Raspberry Pi would be faster ;-)
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