A: It's possible. While sometimes user data is preserved, a major firmware update, especially one done via USB, may reset your TV to factory settings. Be prepared to reinstall apps and adjust your settings after the update.
Never turn off the TV or unplug it during the installation process, as this can "brick" the device (render it unbootable).
Insert the USB into the TV's USB port while the power is off. Skyworth 40e2000 Firmware Update
Operating systems on TVs require periodic maintenance. Skipping updates can leave your television vulnerable to performance degradation.
The firmware update is taking a really long time. What's up? A: It's possible
Ensure the file is named exactly as required by the manufacturer (typically MstarUpgrade.bin or upgrade_73.pkg ). Do not leave it inside a .zip or .rar folder.
This is the method. It’s highly reliable for models that won’t boot normally or won’t accept an Over-the-Air (OTA) update. Never turn off the TV or unplug it
Keep holding the power button until the screen displays an "Upgrading", "Software Updating", or blue progress bar screen. Release the button once this appears.