Download (mod updated v3)
Volume Boost - Google Drive
1. Download zip file and put into your phone storage.
2. Open TWRP.
3. Install zip file and Reboot.
3.1 Install Headphone_Speaker_Volume_Boost.zip file for Volume Boost.
3.2 Install Z5 Sound Mod file from PDesire thread and this mod for PDesire Sound Mod & Volume Boost.
Thanks to PDesire, it is really good sound mod for Sony devices.