Since Noa is a brand often found in the Adriatic/Balkan region (Hangar 18), you might check local support archives or contact regional service centers.
Sites like BadCaps or Electroda often host firmware dumps for various TV brands. You may need to search specifically for the 6A358 board model there. Download 6A358 1920x1080 Noa Vision N43LFOS part04 rar
Flashing the wrong firmware (even if the board number matches but the panel resolution or brand is different) can permanently brick your device. Ensure the file name exactly matches your TV's panel sticker. Since Noa is a brand often found in