Normally I looked at the forum and saw that there was a limitation or adjustment related to SNR Margin (dB).  
Then, when I looked a little more, I saw that someone opened support on this topic, I saw that the TP-Link user commented under it and offered the beta version, and I tried it to see if it would work for me, and it was the opposite, 8 SNR Margin value was 12, I want to fix 4, and the reason is that I don't get the full speed coming to me, SNR Margin limits and I don't want to change the modem, and I don't want to change the modem, this can be adjusted in A companies. 

And I said again, I did research on this subject in the form, I know that the SNR Margin Lock is set automatically, but it would be nice if the SNR Margin Setting is brought to us users.