Vizio M421VT LED won't keep pic adjustments

[FrankRamiro]

Hi guys;my Vizio M421VT LED,i can adjust custom backlight by turning off Ambient light sensor, and Smart Dimming, but i came to find out when turning off tv and next time i turn it on all settings go back to factory default,i want to keep it at 40 on back light but no avail,anybody knows why the tv doesn't store custom setting?

 

[WhiteNoise]

Something is set to AUTO most likely. Turn off all of the auto picture settings to manual and I bet your problem will go away. Oh and make sure demo mode is disabled.

 

[FrankRamiro]

Something is set to AUTO most likely. Turn off all of the auto picture settings to manual and I bet your problem will go away. Oh and make sure demo mode is disabled.

Thanks WhiteNoise; I've found the solution after so much digging,and specially never giving up;and here is the solution for someone that comes across this situation, here it goes;
-------------------------------------------------------------------------------------------------------------------------------------
TV is set to Store Mode (aka Shop Mode, Demo Mode) instead of Home Mode. In this case it will always revert to the vivid settings you see in showrooms. This feature usually appears in the Initial Setup Menu.

Go to the Help Menu and select the Guided Setup feature which will take you to the First-time Installation. When the Home/Store option appears, select Home. This allows you to later set and store your own custom settings.
------------------------------------------------------------------------------------------------------------------------------------

 

[FrankRamiro]

i have bad news,well i spoke too soon about that i had it fixed but the next day turned tv on and all custom adjustments were not there but the Factory default, i did exact per,fanny tv stores antenna settings and channels ,input, labels and most of everything else i did set up per instructions using home mode instead of Store mode, and went through the install process,then turned off tv and turned it on all was good. but next day everything went to default ,what a bummer,
I guess i have to use Back light forcefully at 85 that's the minimum best default pic settings,which is Game, Football, which is a nice pic anyway, it also has back light at 50 with cinema setting but it's too blur due too low contrast and color, forget about the back light leds extended life.

 

[FrankRamiro]

HI guys; this time i have good news for now, update on my Vizio M421vt custom pic adjustments issue. Well today after doing again the factory default and complete installation in home mode and configurations, i went in the pic adjustments and adjusted custom pic settings to my liking and instead of turning off TV with remote control,(which is not the original for this model) i turned off TV on the TV control panel and a few hours later i turned TV on with remote and my custom settings were all there,already tried two times and all good,don't know if powering off tv on the tv control have anything to do with it,yet to be seen,maybe i have to turn off tv on the tv,keep my fingers crossed.