Use this to program LCD monitors without opening the casing.
Look for a file named something like RT809F_Setup_2023.rar . Extract the Contents: Use a tool like WinRAR or 7-Zip. Download RT809F Programmer Instruction rar
Inside the extracted folder, look for a "Manual" or "Instruction" subfolder containing the PDF guide. Quick Tips for First-Time Users Use this to program LCD monitors without opening the casing