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hdmi_mode=87 indicates we create a new hdmi mode named 87.

hdmi_drive=2 selects the Normal HDMI mode.

After the modification is done, save and exit. For more details about configuring

config.txt, refer to Raspberry Pi official website:

https://www.raspberrypi.org/documentation/configuration/config-txt.md.

Step 3: Reboot Raspberry Pi.

Reboot the Raspberry pi with the command sudo reboot.

sudo reboot

 For Raspberry Pi 4

1) Click the Raspberry Pi icon -> Preferences ->Screen Configuration.