Hey there susu8309,
We understand you're experiencing an issue with your iPhone 8 photos being blurry after updating, and we'd like to share a resource that can help.
Check it out here: If the camera or flash on your iPhone, iPad, or iPod touch isn't working
Specifically, take a look at this section:
"If the camera isn't working
- Remove any case or film that might block the camera. A metallic or magnetic case or camera attachment might interfere with the camera on your device.
- Test the camera by trying to take a photo.
- If the photo is blurry, clean the front and back camera lenses with a microfiber cloth. If you see dirt or debris inside the lens or if the camera lens appears to be misaligned or blocked, contact Apple Support for help with your iPhone, iPad, or iPod touch.
- Restart your iPhone, iPad, or iPod touch.
- Test the camera again by taking a photo. If your device has a front and rear camera, check if one or both isn’t working. To switch cameras, tap the rotate button."
We hope this helps!