Links are Updated. At last found with successful root privilages and with update of vibe ui 3.5
Source from lenovo club, based on 6.0
Also given root zip for 6.0 and 5.1 Version.
Faster download links will be updated soon after uploading.
ROM LINK Password: tnrj
5.1 root zip password: bbs.lenovo.com
Also had root zips for 5.1 and 6.0 Versions just modified them too with TWRP 2.8.7.4
How to root:
1. Open Root zip on computer, click on K3 Note root.exe file
2. Connect your Phone by switching on USB Debugging mode let drivers install and click on first shown adb in software so that your device can connect if connects automatically no problem.
3. Now click on root dont panic your phone will switch off and install it now click on ok and after completing take out your device and check it.
update log
0. Repair System partition available space is too small problem
1. Repair RE Manager can not move files to the System partition