How to flash ? 
Download all of file link in the downlaod 
Install driver on your pc 
Open spd upgrade tools 
Load pac file then start 
Hold on volume+ 
Insert  usb cable 
Procedure hasbeen start 
Wait until completed........................................................................................
After complete unplug usb cable then remove battery & insert battery again, Now press power on. 
Coungrats....... 
You will be success frp remove on your walton primo d9
...................................................................................................................................................................
.....................................................................................................................................................................