Plug the TV back into power. Some models will start the update automatically, indicated by a blinking standby LED.
Download the .zip or .rar archive and extract it. Look for a file named allupgrade_3663_sos.bin or similar. Place only the .bin file in the root directory of your USB drive. Update Process: Turn off the TV and unplug it from the power outlet. Insert the USB drive into the TV's USB port.
To download and install the firmware for a Nordmende P50-3663STV6.0 Download P50 3663STV6 (1366 768) Nordmende USB zip
Do not turn off the power until the process is 100% complete. Once finished, the TV will usually reboot or return to a standby state. Factory/Service Menu
If the TV is functional but requires a reset or fine-tuning after an update, you can typically access the factory menu by pressing on the remote. Update Guide for Akai & Nordmende TVs | PDF - Scribd Plug the TV back into power
If it does not start automatically, hold the button on the TV (not the remote) while plugging it in.
Use a USB flash drive (8GB or smaller is recommended) and format it to FAT32 . Look for a file named allupgrade_3663_sos
(1366x768 resolution), you must match the firmware specifically to your TV's mainboard and panel model. Firmware for this board is often shared across several brands like Soundmax or Akai that use the same hardware platform. Board Model: P50-3663STV6.0 Resolution: 1366x768 Common Panel: PT320AT01