JTAG/UART/SPI/Diagnostic I/O used in Sony repair centers if a PSVita couldn't be fixed by software.

Pictures

<imgur>cWujmwt.png</imgur>

Pinout

Pin	Name	Description
1	GND
2		Connected to JL Pin (Bottom left 1st)
3	GND
4		Connected to JL Pin (Top left 1st)
5	GND
6		Connected to JL Pin (Bottom left 2nd)
7		Connected to JL Pin (Top left 2nd)
8		Connected to JL Pin (Top left 3rd)
9	GND
10	GND
11
12
13
14
15	GND
16	GND
17
18
19
20		Connected to JL Pin
21	GND
22	GND
23	VDD
24	VDD