How to Access TCL 6 Series/R646 TV Secret Service Menu | Hidden Feature | TCL Smart / Android TV

There are a lot of different codes on internet but they do not work for all modern TCL TVs.
Today we will show you How to access to Secret Service menu on TCL TV.
All the Tips, Secrets, and Hidden Menus of the TCL Smart / Android TVAll Secret Codes On TCL 408 | Hidden Codes & Settings. TCL TV 6 Series/R646 Secret Service Menu.
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[@SidneyHorner-ob7ts]

Hi. I have tcl LED55UE6000 model. Tv settings do not have "brightness" feature. Any idea how can access special tcl menu on this model??