iPhone 12 Speaker Volume Very Low After iOS 26 Update + Screen Flickering Issue

Hello everyone,

I am using an iPhone 12 and iPhone 13. After updating my phone to iOS 26, I started facing serious issues with my device. The speaker volume has become extremely low. Even at full volume, I can barely hear music, videos, or speaker calls. It feels like the speaker is almost not working.

I have already updated my phone to iOS 26.1 and iOS 26.2, but the issue is still not fixed.

In addition to the speaker problem, I am also facing a screen flickering / fluctuating issue occasionally, where the display brightness or screen seems to fluctuate randomly.

These problems started only after the iOS 26 update. Before that, everything was working perfectly fine.

Has anyone else faced the same issues on iPhone 12 after iOS 26?

Any solution or guidance would be really appreciated.

Thank you.