"How do I fix the sound on my phone?"에 답변THIS FIXED MINE.. My volume was fine on my zte zmax pro until my phone auto updated then it was so quiet i could barely hear it, i was late for work because i didnt hear my alarms and everything. but doing this fixed mine and its back to normal. STEP 1: POWER OFF PHONE STEP 2 PRESS AND HOLD THE POWER BUTTON AND THE VOLUME BUTTON UNTIL THE ZTE SCREEN POPS UP AND RELEASE STEP 3: HOLD THE VOLUME DOWN BUTTON UNTIL A TECH SCREEN SHOWS UP AND HIT THE VOLUME DOWN BUTTON TO GO TO THE OPTION THAT SAYS " WIPE CACHE PARTITION" PRESS THE POWER BUTTON TO SELECT IT WILL ASK YOU IF YOURE SURE THAT IT CANT BE UNDONE, USE POWER BUTTON TO SELECT YES AND THEN WAIT UNTIL IT SAYS CACHE WIPE COMPLETE AND USE POWER BUTTON TO SELECT "REBOOT NOW" YOUR PHONE WILL REBOOT AND SOUND WILL BE BACK TO NORMAL. THIS DIDNT AFFECT ANYTHING ELSE ON MY PHONE EXCEPT MY VOLUME I STILL HAVE ALL CONTACTS PICTURES, APPS, ETC. I HOPE THIS HELPS YALL, PLEASE SELECT HELPFUL IF IT WORKED FOR YOU!