On this page, you will find the official link to download Lenovo Vibe S1 Lite S1La40 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 Vibe S1 Lite S1La40 Stock Firmware (flash file)
File Name: Lenovo_Vibe_S1_Lite_S1La40_MT6753_S294_161229.zip
File Size: 2 GB
How to Flash: Follow Tutorial