This is exactly what I tried but no luck reset ATV also. Guess what I purchased TV in 2014 and I am told that I might need SEK-3500 or SEK-4000 unit some Evolution unit that actually has HDCP2.2 and HDMI 2.0 ports what a mess
The Samsung 2013 UHD F9000 series doesn’t have any HDMI 2.0 ports, so the Apple TV will never connect at 4K to those ports. I have a Samsung HU8550 (2014 series) that I recently picked up an EVO Kit for. My TV was in a similar situation where it only has one port that is both HDMI 2.0 / HDCP 2.2 (the MHL port on HDMI 3). I noticed that if I connected to that port, I was able to get the stream to buffer up to 4K (verified this using the developer tools), but that with any other port on the TV, the lack of HDCP 2.2 was stopping the stream from buffering any higher than 1080p.
I grabbed an SEK-4500 from BH Photo for $199 (regularly $299 and still on sale).
https://www.bhphotovideo.com/c/product/1448902-REG/samsung_sek_4500_za_sek_4500_evolution_kit.html
Although this doesn't connect to the One Connect port and has to use HDMI, I verified that my Apple TV now streams at 4K. It also now detects HDR but doesn't send a signal to my TV to increase the backlight / contrast, so I've turned off Match Range and set the Apple TV to SDR 4:4:4 chroma. Also, because the SEK is processing the image, other devices like my Directv STB have a much clearer picture. The universal remote that it comes with is also nice.
One big difference between the SEK-4500 and older EVO kits is that it connects to HDMI instead of the one connect port. My TV doesn't have a one connect box, so it's not a problem, but for TVs that only have HDMI ports on the one connect box, you'll need to connect the SEK-4500 to an HDMI port on the one connect box. If you can find an SEK-3500 (they are quite expensive right now on eBay), you won't have to daisy chain the SEK-4500 through your original one connect box as the 3500 replaces the original one connect box entirely.
A couple other things, the SEK-4500 doesn't support ARC (instructions mention using the original ARC port on the TV if you need it). Also, the SEK-4500 doesn't switch to 3D mode, however, you could either connect a 3D blu-ray player to a port directly on the TV or manually switch to 3D mode using the TV's original remote.