Hi shoukvincamacho,
Is your model ZD552KL?
Kindly provide me your firmware version (Settings > System > About Phone > Software information).
Is the volume low when using speakers/earphones/bluetooth?
What kind of apps have this problem?
Could you provide us a music link, and tell us in which part of the music does the volume feel low?
Could you recall your previous firmware version?
Thank you 🙂