
Enable USB Debugging Mode on One Plus One from Settings > Developer Options. In case anything goes wrong then you’ll be able to restore your data. It is highly recommended to take a proper backup of your relevant data and settings on the phone using a custom recovery such as CWM or TWRP. Download and install proper USB Drivers for the LG V40 ThinQ on PC. Make sure that the battery level of your LG V40 ThinQ is at least about 80% before moving to the installation guide.