Despite how routine and simple your TV use may be, it can be important to keep the tube, like other devices, updated to the latest software and firmware version. And while many smart TVs routinely check for the latest updates, it's possible yours doesn't. I don't keep my TV connected to the internet, for example, so there's no way for me to check for updates via wifi.
To start, you'll need three items: a TV (to update), a computer (to download the update), and a USB drive (to store the update).
If you have your TV mounted or backed up to a wall, it might be a bit tricky to find, since the model number is usually on a sticker on the back of your TV. If you can, pull your TV as far out as you safely can, and use a flashlight or your smartphone camera to locate the sticker with the identification number. You can also see if your TV has its model number in its settings menu. This may be in an "About" or "General" menu.
Once you find the right software version, download it to your computer. If it arrives as a ZIP file, you can either click it to unzip (Mac), or right-click and choose "Extract All" (Windows). Once you have access to the files (which should appear as .bin or .img files), connect a USB stick to your computer and move the files to the drive, making sure to add the files to the main drive and not any of the folders that might be on it. Choose to eject the drive from your Mac or PC before physically removing it from your computer.
If the update didn't work, format the drive
One possible issue with this method concerns the USB drive itself. If it isn't properly formatted (to FAT32), your TV may not recognize it.
If the drive is small enough, you can format it through Windows' Explorer. Right-click on the drive, then choose Format. Here, choose FAT32 under "File system," then check Quick Format. Click Start, click OK on the pop-up that warns you you will lose all data on the drive, and you're set.
On Mac, plug your drive in, then open Disk Utility. Choose Erase, then choose MS-DOS (FAT) from the "Format" drop down. Now, click Erase, then choose Done when finished.
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