Just click the "Update Raspbian" to update.

3D files of board v2.5 .step and .stl https://drive.google.com/drive/folders/1Imnye9MxCWCUlUC2pw_A6A5WoUFMV1xj?usp=sharing

New hardware v2.5 board arrivalled.

about the real-time, here is the result that is almost perfect for real time control drivers. the output signal of the one raspberryPI's...

HDMI LCD，camera,...