DESCRIPTION

File Name      A6020a40_USR_S102_1611231800_Q1021101.2_BMAIN_16G_ROW_qpst

Model            Lenovo Vibe K5 (A6020a40)

Country          India, HongKong, Russia

Size               1.44 GB

Security         2016/11/23

Storage         16 GB

HW                40

CPU  MSM8929 Snapdragon 415 octa core (Qualcomm)

This is official rom.

Flash this file with 'Qualcomm' flash tool and then wait for complete start.

Possible they want your google account to varify you.

Now if you show the home screen after skips and 4G network calling problem so now put the country file in your phone memory.
Example : i am from 'India' so i copy only "India.ota" file.

Now go to recovery.

Install 'India.ota' from internal. after install reboot your phone.

Note : You try at your own risk.

※Please make a backup of your device before installing or updating ROM