While holding the button, .

:

DO NOT turn off the TV during the update. This can take 5–15 minutes.

When your smart TV based on this board starts acting up—like getting stuck on the logo or failing to load apps—the solution typically involves a firmware flash or a system USB Firmware Update (The "UPD" Fix):

The exact printed on the back plastic casing of your TV

Search for the main binary file. It is traditionally named MstarUpgrade.bin , allupgrade_338_512M.bin , or a variation matching your panel configuration.