On this page, you will find the official link to download Lenovo Yoga Tablet 3 850M Stock Firmware ROM (flash file) on your Computer. Firmware comes in a zip package, which contains Flash File, Flash Tool, Driver and How-to Manual.
Download Lenovo Yoga Tablet 3 850M Stock Firmware (flash file)
File Name: Lenovo_YT3_850M_OTA.zip
File Size: 783 MB
How to Flash: Copy the update.zip file the phone sd and flash it through the recovery mode.