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If your issue is about your TV being 4K and your Mac not allowing you to display higher resolution than 1080p, you have to first make sure you're not using screen mirroring. You have to expand the desktop to use separate resolutions.

Now, if you still don't have the required resolution, you can try using the following script from GitHub: https://github.com/vinc3m1/mac-pixel-clock-patch

It'll remove any limitation your Mac might have about external displays.

If your issue is about your TV being 4K and your Mac not allowing you to display higher resolution than 1080p, you have to first make sure you're not using screen mirroring. You have to expand the desktop to use separate resolutions.

If your issue is about your TV being 4K and your Mac not allowing you to display higher resolution than 1080p, you have to first make sure you're not using screen mirroring. You have to expand the desktop to use separate resolutions.

Now, if you still don't have the required resolution, you can try using the following script from GitHub: https://github.com/vinc3m1/mac-pixel-clock-patch

It'll remove any limitation your Mac might have about external displays.

1
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If your issue is about your TV being 4K and your Mac not allowing you to display higher resolution than 1080p, you have to first make sure you're not using screen mirroring. You have to expand the desktop to use separate resolutions.