Download latest Android KitKat 4.4.2 stock firmware for Lenovo Sisley S90 smartphone from here or from here. Download another Lenovo firmware from here.
Firmware: Lenovo S90 MSM8916 180563 20141201 / Lenovo_S90u_Lang_EKL-2
Model: Lenovo Sisley S90 smartphone
Image file size: 599 MB
Platform: Qualcomm Snapdragon 410 (MSM8916)
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