After posting the thread, I found that stock rom:
Lenovo Phab Plus Stock ROM 5.1.1
It is the best ROM that it actually worked. When you extract it, you will find download.cmd
. To make it work, I had to enter command line by line. Eventually it worked.
1. Make sure your command window is "administrator"
2. Go to "E:\Lenovo Phab Plus\PB1-770M_5,1_S405_160420_ROW\PB1-770M_5,1_S405_160420_ROW\SW" (my location) and click ctrl+shift+right mouse click and choose "Open command window here
" as shown here:
Then open Command.bat located in same file using right click--> edit
and execute commands on command window line by line:
Hope it helps others to make their life much easier than this horrible day