Galaxy Note 8 downgrade firmware

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Oct 3, 2012
Hello everybody.
I have a Galaxy Note 8 phone. Frankly, I'm starting to think that every update is making the phone a bit slower. For this reason, I want to go back as far as I can go and install the oldest firmware I can. But I did some research and found out that if the bootloader is different, I would not be able to install it with odin. How do we understand this? Which version can I go back to?
Also does this trip the Knox counter?
Enter the exact model name in the search box.

You can only roll back the firmware to a version with the same BIT that is currently on the phone. You will check it in the firmware list for your model.

Flashing the original firmware does not trip the knox flag.
Changing the bootloader and/or rooting trip the knox flag.