Download Android Marshmallow 6.0 for Jesy J9S Smartphone
This firmware is for Jesy J9S Smartphone with Mediatek MT6755 as CPU. BTW, you can now buy Jesy J9S Smartphone from Coolicool.com for a very good price with free shipping world wide.
Freeme OS Firmware details
OS: Android Marshmallow 6.0 stock firmare
Image file size: 710 MB
Platform: Mediatek MT6755
Build number: s12v55c2k_js_6m_cta-eng 6.0 MRA58K 1510815904 release-keys
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.