: Once the standby light begins to flash rapidly or an "Upgrading" screen appears, release the button. Do not turn off the TV during this process.
: The TV will usually restart automatically once the process is 100% complete. Troubleshooting Tips Download MS3458 U801 3840x2160 Vios TV49174K rar
Do you have the (often printed on the green PCB) to double-check this firmware's compatibility? How to Update Your Vizio TV Software : Once the standby light begins to flash
: Ensure the file is named correctly (usually MstarUpgrade.bin or similar) and that you are using a USB 2.0 port if available. Troubleshooting Tips Do you have the (often printed
: Use a USB drive (8GB or smaller is often most compatible) and format it to FAT32 .
The firmware you are looking for, , is specifically designed for the Vios TV49174K
: Look for the exact filename MS3458 U801 3840x2160 Vios TV49174K.rar on specialized electronics forums or firmware repositories.