Thank you for your kindly assistance. I have obtained ULINK2 debug adapter and wish to use 210pins ARM slot to upload and debug the fireware. But I find out that only J5 of Pixy5 support the ULINK2 plug. I need to know how to transform the patch to slot of 25pins and how to match the pins one by one accordingly. Your cooperation is greatly appreciated.
Hi. I just soldered on a 2*5 10pin 1.27mm header on to the pixy J5, you need something like this: https://www.elfaelektronikk.no/elfa3~no_no/elfa/init.do?init=2&shop=ELFA_NO-NO&item=43-914-18
Note, its SMD, and kinda tricky soldering, you should know what you’re doing 
Good luck!