Flashing the wrong firmware can permanently brick your TV. Always verify your Panel Model Number (found on a sticker inside the TV) against the firmware details before proceeding.
A common repository for USB firmware updates where these specific board numbers are listed. Download 358M2C3&358M3C2 1920x1080 Intek Mirror part01 rar
Insert the USB into the powered-off TV, then hold the Power button while plugging it in to trigger the update. Flashing the wrong firmware can permanently brick your TV
Copy the extracted .bin or .img file to the root of the drive. Download 358M2C3&358M3C2 1920x1080 Intek Mirror part01 rar
Do you have the of the TV you're trying to fix so I can help you verify the version? Обновление ПО USB - KenotronTV
Another major database for TV repair technicians (requires a technical test to register and download). Installation Basics