I use the wired option, and I don't use a sync cable. I must've either lost it, or I never received one. It's only one base station that doesn't work. However, even after installing firmware on the working one, it still doesn't turn on. Like, all I wanna do is cut people up with a lightsaber lmfao, so much trouble for a task like that. And yes, I've contacted customer support for Vive many times, and they've never mentioned how rolling back updates doesn't work. They always just said to send it in, but I can't because of the coronavirus. Thanks for the help!