If all the solutions above don't work out, then the iPhone volume low after update issue is very likely to be software-related. To handle this scenario efficiently, you need Joyoshare UltFix iOS System Recovery, a professional iOS fixing program. It can fix over 30 iOS problems, including iPhone call volume low after updating. What do we use it for? To fix the iPhone software issues or to downgrade the iOS to the previous functioning version, and both of them will not cause any data loss to your iPhone as long as you use this program.
Additionally, Joyoshare UltFix will provide you with great convenience. Don't know how to put your iPhone into the recovery mode? Joyoshare UltFix will help you do it for free! Never used iPhone repairing software before? Just a few clicks and our program will eradicate the problems. Almost all models of iPhone, iPad, iPod, and Apple TV are supported.
Key Features of Joyoshare UltFix iOS System Recovery
Enter/exit recovery mode with one-click for free
Compatible with almost all iDevices and iOS 13
Support two modes to handle 30+ issues flexibly
Fix iPhone call volume low after update without data loss