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Fixing an Elgato HD60 S HDMI capture device with the help of Ghidra
This post has a little bit of everything. Hardware diagnostics, some suspiciously similar datasheets from two separate Taiwan chip manufacturers, and firmware reverse engineering.
I assumed that the original Nuvoton MCU I removed had some other protected contents like a bootloader, so I decided to see if I could extract it by installing my new unlocked firmware file as an update through Elgato’s software. The Nuvoton MCU communicates status information back to the CYUSB3014 through I 2 C. The CYUSB3014 receives the video data stream from the IT6802E (likely through the MAX II CPLD, putting it in a format suitable for the CYUSB3014 to grab) and sends it to the computer over USB. Then, you remove the jumper on the PCB (instructing the Cypress chip to boot from USB), upload cyfxflashprog.img to RAM using download_fx3, and use a modified version of fx3_spitest to download the entire SPI flash contents and replace it with your patched LED section.
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