I lost my original...found a pin layout online from a photo of the board off a disassembled smartwatch. Looks like you guys already have the pinout covered though. What I did to make my cable was I used staples. I straightened out 4 ordinary office staples, bent one end up at a 90° angle...just a few millimeters. Then I used some JB stick (JB weld in putty form...you can buy it at your local hardware store, auto parts store, or Walmart). It hardens in minutes, is hard as steel, and most importantly is non-conductive. I painstakingly arranged the four staples on a bit of the jb putty, put another small layer of the putty over the top (so just the tips if the staples were exposed as well as a few millimeters of the other ends), and quickly wedged the whole thing into my Smartwatch. I pressed the spring clip down using it as a mold, then quickly and carefully pulled it out so it did not adhere to the watch. 5 minutes later the connector was hard as a rock. I then soldered my bare end of my USB cable to the staple ends, put some heat shrink, and dropped a little ball of solder on each of the 4 protruding bent staple tips at the other end of the connector. The 4 balls of solder now make nice shiny contact points to line up with the 4 terminals on the watch. Now I have a rock solid, professional looking diy charging cable. Been working for 4 months now no issues. Took me less than an hour for the whole project once I thought up the design.
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