How to enable HDMI 4K 60Hz with Android 7.1 & RK3399

I want to know how to enable 60Hz with 4K(3840x2160) in Android OS 7.1 and firefly-rk3399 via HDMI.
In case default upload.img, max resolution setting is 3840x2160 30Hz. Also I don’t use other video output. Is 4K 60Hz output possible?

it depend on your TV max resolution supported and your hdmi wire . check two of them

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