Making attempts at documenting and reversing cheap chinese USB HDMI capture cards with EEPROM dumps and firmware extraction.
First dumps uploaded from "USB3.0 Video Capture HDMI 4K" that enumerate as eEver USB Video device, with "No signal V1.8" shown if no video input. However my units do not enable on USB 3.0 even though they have the correct pins connected and all traces connected. update: Reflashing U9 with alternate bin fixed unit and unlocked YUY uncompressed 5gb/s stream.
 
HDMI Input -> MST097B
MST097B-1> IT661221FN -> HDMI Output
MST097B-2> EJ511 -> USB 3.0 Output
- USB_U9_dump.bin is from my units that do NOT enumerate on USB3, only linking on USB 2.0 High Speed (480MBS).
- USB_U6_dump.bin is 100% the MStar MST097B HDMI RX ASIC configuration.
- USB_U9_dump.bin confimed to be the EJ511 USB UVC ASIC configuration memory.
Binwalk entropy graph U6(HDMI receiver)
Binwalk comparison of U9 dumps (USB camera ASIC)
