Download Android Marshmallow 6.0 stock firmware for Leagoo Z3C smartphone from here or here. Download Android Marshmallow 6.0 OTA firmware update for Leagoo Z3C smartphone from here or here. Download another Leagoo firmware from here.
Archive： LEAGOO_Z3c_OS1.1_Lite_E_20170301.pac / Z3c-fota-Package.20170301
Image: LEAGOO_Z3c_OS1.1_Lite_E_20170301.pac /
Firmware: Leagoo OS 1.1 Lite based on Android Marshmallow 6.0 firmware
Model： Leagoo Z3C smartphone
Image file size: 718 MB / 1.41 GB
Platform: Spreadtrum SC7731c
Build number: sp7731c_1h10_32v4_bird:6.0/MRA58K/android.20170228.213530:user/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.