Download Android 6.0 firmware for LeTv LeEco Le S3 X626 from here, here or here. Download previous firmware from here. LeEco Le S3 X626 4G Smartphone First Impressions & Quick Review here. Unboxing LeEco Le S3 X626 4G Phablet here.
Freeme OS Firmware details
Archive: 171006-LeTV LeEco Le S3 X626 -5.8.018S-6.0.1
OS: Android Marshmallow 6.0 stock
Image file size: 1.78 GB
Platform: MediaTek MT6797 Helio X20
Image: 171006-Letv2 LeEco Le -X626-5.8.018S-6.0.1
Product name: s2_plus
1. At first, pls make your X626 enter the mode by pressing the button “The volume down” and “Power” at the same time, then connect X626 and your computer which has installed the firmware
2. Find the doc.”The volume down and Power.bat” in the firmware, and choose and enter the doc.
3. Untill the screen shows “OK” that means you have installed the firmware successfully.
4. Pls reboot your phone and use the X626 normally.
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.