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What is a factory menu? The factory menu is not a menu for company employees to eat in the company. The factory menu is, ah, in fact, I would not explain it. Anyway, it is the factory menu undefined.
Oh, smart TV due to the huge android system development, each part is related to each other, so there is a big chance of some minor problems, small BUG. At this time, we may not be able to solve this problem. You can use this factory menu at this time.
Below I put together some of the frequently used factory menu options to make a summary, hoping to help everyone.
The first time you use a friend may ask how to open the factory menu? See this post for details: http://bbs.shafa.com/thread-1301050-1-1.html
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First, open the factory menu, this is the content of the first page, the following figure is two different models of TV, representing the Android 4.0 (4.2) and Android 2.2 factory menu options. 
The first line is the TV firmware version, you can see your own firmware version, model and other information, generally used to find new firmware or motherboard upgrade
The second line is the release time of the TV firmware itself, not the upgrade time.
The third line factory menu directory press the left and right keys to switch
The fourth line TV model, this is the left and right buttons can be adjusted, this model represents your TV's own model or series. If you do not have problems, do not adjust! If you can't compare with your TV model or series, you can adjust it at this time.
The fifth line of screen parameters, the TV's own model or series containing screen parameter information must not be adjusted if there is no problem.
Some TVs will be screened after the upgrade or the first time they are opened for the first time. When the screen is turned on, the screen parameters are incorrect. In this case, the screen parameters need to be adjusted. Everyone can go to the forum to find their own TV screen parameters.
Others are generally not used, and they should not be disturbed.
Second, this option is generally the option you will see on page 3-6. 
The first line of EEPROM initialization is similar to a computer motherboard's brush BIOS. Do not use often!
The second line clears the network and activates some friends TV can not be activated (basic for the old 2.2 system friends more practical, the new system is automatically activated), or the first boot into the application store to download the program requires a user name password, it is necessary Use this option.
The third line of application cleanup ROM does not move, clearing installed applications and cached data.
Some friends can not activate the TV, or the first time you boot into the application store to download the program requires a username and password, you can press to clear the network activation and then EEPROM initialization this time the TV will automatically shut down boot, generally this will return to normal.
Third, the general options in the last few pages 
The first picture some friends posted to ask what is the use of the three options, this three options for our average user, no use, do not arbitrarily change.
In the second figure, when some nonstandard applications or incompatible applications are frequently installed, the TV may crash or some other program may stop running. This option can be used at this time. If the factory default is not resolved, then the application will be cleaned up after the TV restarts, and the EEPROM initialization will be restarted. This is basically OK. Remember that before this process, you must remove the external USB storage device or SD card from the TV and format it in FAT32 format.
The third picture has some televisions and some televisions do not. Do not tangle.
Fourth, continuous update
There is a risk of data changes in the factory mode. If there are no major bugs in the TV, don't change it. Be careful to reduce the size of the blackboard.
This factory menu analysis tutorial is my own summary, 100% original, does not represent the willingness and perspective of the manufacturer, and does not assume any responsibility. If the TV is using a problem with no major bugs, it is recommended that friends do not arbitrarily change the internal data. Be careful to reduce the size of the blackboard.
I wish you all the altar friends a nice weekend! Rational Internet access! Civilization online! Start from me!
April 13, 2021