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I don't understand then because you said you have to change it with room light but brightness setting only has one correct setting, level 16 not visible, level 17 barely visible in a dark room.
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Do you know how to rollback my firmware ? I thinked it was impossible.
I tried with classic USB method but that doesn't work
I tried with classic USB method but that doesn't work

samgo.tv has the method but it's still not clear what you are trying to do. If brightness needs to be set at 79 (or whatever), just leave it there - it's not a problem. If you maximum light output is too low then you might roll-back or adjust the ADC values to increase it.
If you want to have a day vs. night setting you change gamma/contrast for that, not brightness. A contrast/gamma change will mean resetting brightness a click or 2.

















so it's very hard to see my below black bars appear/disappear in fact.
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So I don't know if a tech will come to see my set...
So I prefer to ask
yes, CCW=counter clockwise turn to the left, but only a very small amount. You want the lowest mll possible without the pixel misfires. If you lose black detail it's because your brightness or gamma setting is too low not the mll. I suggest you run the internal pattern under the screen burn protection menu "scrolling bar" and then adjust the Yrr until this pattern is clear.

