You can find various firmware versions ranging from official stock builds to modified custom ROMs: LeEco Le S3 X626 original firmware v5.9.023 (China)
To download the , you must ensure you have the correct version for your device's chipset. While the American X522 model uses Snapdragon 652, the X626 is the Chinese variant powered by the MediaTek Helio X20 processor. Essential Download Links leeco le s3 x626 firmware download