The SM-PCE01/02 cables are hard to find. If anyone what's to get one I can recommend this guy Shimano SM-PCE02 PC Interface for Di2 + STePS. Based in Japan so you pay in yen but service was great and delivery was fast (Fedex)
Got the SM-PCE02 cable from Japan already. Only took like 4-5 days. I have changed region on my EP8 with firmware 4.14 and it worked no problem. . Super quick and easy.