You have to flash two file.
Note: your phone should be rooted and have a twrp installed
* download the given 2 files
* reboot to twrp tap on install look for the 2 files where u downloaded them
* tap on Clear Soundmod (sangga).zip first then u will see an option add more zips to que tap on that and then select TWRP_Arise_Sound_System_Dolby_Atmos_2.zip
* and then slide to flash
*wait for it to flash then tap on reboot
*voila u have Dolby and viper installed