Official ROM K3 Note (K50-T5, K50-T3S), A7000 Turbo (K50a40)
Android 6.0 (S427 ROW) under Flash Tool
GAPPS included
No Rooted
Language support: Multilang
Inside there are instructions for installation
K50a40_S427_160518_ROW.rar/K50a40_S427_160518_RO/DRV_ToolsMTK_flashtool_v5.1536.00.000Koleosг********20150921.pdf
No Format All
Set in the Firmware Upgrade Mode
A source in the Lenovo-Forums.ru
P.S K50a40 full clone K50-T5