3

I was looking at my Raspberry Pi 4B and I saw something like a not soldered place for fpc connector and I got curious what is that!???

just Look under USB2 at top right corner in the image bellow. just Look under USB2 just Look under USB2

4

This is a JTAG connector used for development and testing. Here's a picture of an old Pi B+ featuring the signal names printed on it:

enter image description here

AFAIK it's useless unless you have VideoCore documentation and tools from Broadcom.

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