: Insert the USB into the TV's white USB 2.0 port. Navigate to Settings > Support > System Update > Upgrade from USB .

: Find the serial number on the sticker at the back of your TV. Visit Hisense Support : Go to the Hisense USA Support or your local country's Hisense support page. Search by Model : Enter

: If the download is a compressed file (like a .zip or .rar), extract it using tools like WinZip or WinRAR. How to Install via USB

If your TV is stuck on a logo or cannot update over the internet, follow these steps: : Use a USB drive formatted to FAT32 .

To obtain the firmware for the (main board RSAG7.820.6735 ), it is highly recommended to use official sources rather than third-party multipart RAR files, which can be unreliable or corrupted. Official Download Method