First of All, Welcome to my BLOG On this Thread, you will find the Original link to Download Lenovo Yoga Tablet 3 Pro YT3-X90L Stock ROM Firmware from GoogleDrive. Lenovo YT3-X90L Firmware Package comes in a zip package, which contains Flash File and Flash Tool and Driver with How-to Flash Manual.
Device Name: Lenovo Yoga Tablet 3 Pro
Android Version: Marshmallow 6.0
Install via: SP Flash Tool
File Size: 1.8 GB
File Hosted: Google Drive
How to Flash Lenovo Yoga Tablet 3 Pro YT3-X90L Stock Firmware
Step 1: Download & extract the Firmware on your computer.
Step 2: After extracting Firmware zip file you will find the Smart Flash Tool, Android Driver and Installation Instructions.
Step 3: Install Latest available USB Drivers (Just skip this Step if your Computer already have).
Step 4: Start Smart Flash Tool Then load Scatter File from ”Firmware” folder.
Step 5: Just Connect your Device to the computer using with the USB Data Cable.
Step 6: Press Upgrade Download Option in the Smart Flash Tool to Begin the Installation Procesdure.
Step 7: Green Ring Good Sign will be appear on your Computer.
If You Find Complete Flashing Guide Just Go for Below LINK
Download Lenovo Yoga Tablet 3 Pro YT3-X90L Firmware Update