: While holding the button, plug the TV back into the power outlet.

The TV did not recognize the files. Ensure your USB drive is formatted to FAT32, is under 32GB in size, and that the firmware files are sitting in the root directory rather than inside a sub-folder.

Once you have downloaded the file, follow this standard procedure:

For most modern Telefunken Smart TVs, the "solid" way to handle updates is through the internal menus rather than a portable download, but manual USB methods exist for troubleshooting. The Standard "Success Story" (OTA Update)

When a TV becomes "bricked" (stuck on a splash screen) or suffers from software loops, a portable firmware download becomes the only lifeline. Unlike standard "Over-the-Air" (OTA) updates that require a functional internet connection and a working OS, portable firmware is designed to be loaded onto a USB drive (FAT32 formatted) to trigger a forced hardware flash. The Challenge of Accessibility

Unplug the Telefunken TV completely from the wall outlet. Wait 60 seconds for all capacitors to drain.

Do you know if your unit uses a or an Android operating system ?