1. Extract Required Files from Original ROM:
2 Create a folder and paste the Rom files and the two downloaded files. (firehose)
3 Download an active version of Qfil and follow the video.
Here is the video demonstration of the processes:
<Mod edit: Link removed>
4 Upon completion press the Power, volume down and volume up buttons for 15 seconds.
note when using what qfil turn off the computer wifi.
This apply only if he has flashed a rom via twrp or via fastboot... but with reformated phone , messed up partition table and maybe wrong LUNs .... will not do the trick.
credits to friend: @demonical