On this page, you will find the direct link to download Xiaomi Mi 2S SE Stock Firmware (flash file) from Mediafire. Downloaded file contains the firmware file only.
How to Flash
Step 1: Download and extract the stock firmware on your computer.
Step 2: After extracting you will find the Firmware, and instruction manual.
Step 3: Follow the instruction manual to flash the firmware on your smartphone.
[*] Take a Backup of your personal data before flashing or installing the firmware on your smartphone. As this helps you to recover the personal data whenever any thing wrong happens.