You need the proper virtual_touchscreen.ko version for your firmware. I use the 3.0.8+ firmware on my mk808 and the 3.0.36+ firmware on my T428.
Leolas has compiled the driver for both firmware. For 3.0.8+ the driver is avalaible in the gaming and tv player section and for the 3.0.36+ the driver is avalaible in the topic from leolas (want me to compile a driver for you) located in the rk3066 section
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