: It is designed to be installed via USB . You usually copy the extracted .bin file to the root of a FAT32-formatted USB drive, plug it into the TV, and power it on to trigger the automatic update.
: To access the internal settings (Service Menu) for this board, the common remote code is Input/Source + 208 . Where to Download Download SP33811 1920x1080 USB part04 rar
: The "part04" indicates this is one segment of a split RAR archive. You must download all parts (e.g., part01, part02, part03, and part04) into the same folder and extract the first one to get the complete firmware file. : It is designed to be installed via USB