I've seen the video you uploaded. In the video, some of your steps are incorrect. Here's what you need to do:
1. On your PC, update the ReaSnow S1 firmware to version 5.6.251 (DO NOT set the boot mode!).
2. Follow the tutorial for wiring: connect the ReaSnow S1 to the USB port on the rear of your PS5 Pro, and connect the P5General to the USB1 port on the S1.
3. At this point, the lights should illuminate normally and the device should boot up. If the S1 indicator light is faintly flickering (visible in a dark room), this indicates your PS5 Pro belongs to the latest production batch. Its USB port outputs a voltage significantly higher than the USB IF design specification, triggering the S1's overvoltage protection. You need to purchase a USB hub with an external power supply port. Connect the USB hub to the PS5 Pro's USB port, connect the S1 to the USB hub, and then connect the power supply to the USB hub's external power port (using a charger with a 5V 1A or higher current output specification).