: You must connect to the board via ISP (In-System Programming) points if you are not removing the chip.
firmware, you generally need to look for "dump files" provided by the technician community. Download CV628H A50 EMMC SOFTWARE rar
like a "stuck on logo" screen or a "no power" condition? Knowing the symptoms can help determine if you need the full EMMC dump or just a USB-update file. How to Read CV628H A50 EMMC With Rt809H (Part :1) : You must connect to the board via
: You can find a detailed tutorial on How to Read CV628H A50 EMMC With RT809H on YouTube, which shows the ISP cable connections (CLK, CMD, D0) and the 3.3V power requirements. D0) and the 3.3V power requirements.