Download Android Lollipop 5.1.1 stock firmware for Lenovo Lemo K3 Note smartphone from here or here. Download previous firmware Android 5.0 from here.
Archive: VIBEUI_V2.8_1535_5.128.1_ST_K50-T5 - Lenovo k3 note 5.1 fw
Archive size: 903 MB
Support: Mediatek MT6752
Bonus: Lenovo_USB+pdanet_Drivers, Minimal ADB and Fastboot, TWRP_126.96.36.199_K3_cuoco92 & UPDATE-SuperSU-v2.46.
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.
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