How to flash stock rom on LYF WATER 7 (LS-5504)

Today i am going to tell how to flash stock rom on LYF WATER 7 (LS-5504)....
The links are provided below.....
firmware link:- https://androidmtk.com/download-lyf-s...
qfil tool download link:- http://www.androidbrick.com/download/...

qualcomm drivers(if from above link fails to recognize drivers):- http://www.droidsavvy.com/unbrick-qua...