This is security lock in new android devices when you first time purchase device then it asked enter your registered gmail account after enter account must be remember because if future you will do hardreset or reset device then asked first entered gmail account if you forgot but don't worry to solution for it just see below procedure but before use must remember which is required for frp solution because if any one do not work then you can't solve that problem first of device battery must be charged up to 80%, second of must be working well scatter file or flash tool, third of must be working well micro usb cable and last must be installed driver without driver you can't do that in this post also link available of driver link first install it after try to unlock.
Without reset FRP lock you can't go ahead if you remember first entered gmail account then you can easy do unlock and for unlock must be device connected with internet without internet you can't go ahead this tutorial i can't try with this device but i think is it success and simple way for frp reset lock without any box before use remember must take out simcard or micro sd card and i think remember from this procedure you can't save data like contacts, photos, videos, mp3 songs, notes, email etc so now let's go how to bypass gmail account in Lenovo K3 Note K50-4A40 ? see below procedure7. Write there above code in both box
10. Install driver from above link, if driver installed in your computer then starting automatically