For official software or troubleshooting, you can refer to resources like the Nordmende Update Guide or NinjaOne's Firmware Guide for general best practices.
: Do not turn off the TV until the progress bar reaches 100%. Interrupting this process can permanently "brick" the device.
: Place the extracted firmware file (typically ending in .bin or .pkg ) in the root directory of the USB drive, not inside any folders. Standard Update Procedure