Hi, here is the Lenovo Lemo K3 Note smartphone firmware.
Please click the link to download: Lenovo K3 Note Android 5.0 2GB 16GB Smartphone Pure Version Firmware
when you decompress the RAR file, there are two files in the folder, one is the firmware, and the other is the Flash tool.
Flash guide: How to flash MTK smartphones with SP flash tool?
Have a nice day!