J4 port

Hallo, I have a little hardware question.
Cleaning the device, I found out that there is a hardware port called J4 in the device.
Does anyone what this is for?
Link to the picture is attached.

https://ibb.co/yVj397V

Cheers!

It’s for when J3 isn’t enough, but J5 would be too much.

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I think it’s a JTAG port for the DSP.

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Thank you very much for the information, H1!

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It’s a port for use when celebrating US Independence Day.

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