Hello everybody! I have a 3gb/32gb mi4c, no warranty, with the following problem: it wont connect anymore to pc, I uninstalled the drivers but right after reconnecting the phone to pc, windows 7 shows a device is found but wont install it, the proccess ends with Unknown Device in Device Manager. Also, it wont accept my otg drive (kingston microduo 3C), nothing appears at USB Storage in settings. I checked with another cable, anoter usb port, even on another computer, but with no luck. Also, the charging time from adapter is over 5 hours, from about 10% battery (the phone reports USB charging). If I turn off the phone, it wont charge, nothing appears on the screen, the led is off. As I found on the web, people with similar problem tried to change the USB charging board with a new one. I replaced it myself with a brand new one, but it didn't resolve the defect. The only difference was with the new usb board, the phone could charge if it's turned off, but with the same slow speed. So, do you think the mainboard is faulty? Or other part, like a flat cable maybe? I guess ROM version isn't quite important, since not even in TWRP it wont connect to pc or to otg drive.