After I connected my desktop via a USB cable to the printer, BOTH THE PRINTER AND MY COMPUTER DIED. I have no idea how a USB cable connection could even do that, but it happened anyway. I've asked Creality support to help me and have sent my computer to a repair shop.
I was running the firmware the printer was delivered with. Needless to say, I'm very unhappy at this moment... I was getting the hang of getting some nice prints and now this...
My suggestion: Do NOT connect the printer via USB, unless Creality guarantees it is safe to do so.
This is exactly what happened to me this last Thursday when I finally received my printer. After going through all the standard first tests, I went to preheat to print out a calibration cube for my first print. Printer reset at 45C on the hotbed temp, then would reset every time you attempted to do a pre-heat. I decided to hook it up to my computer since I didn't have a Pi ready, and figured I could verify if this was an issue with the printer or just the control screen. Plugged it in, turned to open the software and then notice smoke coming out at the plug on the printer. Got so hot it melted the end of the USB cable wrap. Pulled the power on the printer and the usb cable but it was too late. My computer motherboard is fried as well as the printer motherboard. I dearly wish I had found these posts and the cr6 subreddit prior to getting my printer, because I could have saved both of my devices. Now I'm currently out a brand new printer that I never even got to use as well as a recently purchased motherboard on a computer only a few months old.