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I have a Raspberry Pi 3 running Raspbian Stretch.

I need to connect it to a 17" 4K UHD (3840x2160) monitor via HDMI, I tried to do that but noticed that resolution is automatically set to full hd.

I tried to edit my config.txt as described here and reboot the system, but nothing changed, the monitor is still seen as a 1920x1080.

Is there another way to set the correct resolution and use a 4K monitor on the RPi 3 with Stretch?

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    What is a RPi 3? Is it a RPi 3B, RPi 3A+ or RPi 3B+? – Ingo Mar 6 at 12:15

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