Then, enable multiboot by writing the U-Boot to the SD card's offset (Amlogic's "boot-from-SD" signature):
A final reminder: Because "RealUNIX Pro" is a moving target (v3.5 released in May 2025, v4.0 in beta), always check the original forum thread for the latest .img file. The process you learned here—shorting pins, using USB_Burning_Tool, and driver management—will work for almost any Amlogic S905X/S912 box on the market. realunix pro hg680p install