Hello my iPhone XS Max is having a blurry picture I mean the back camera

Greetings Tablet1497,  

Since your Camera is blurry after updating your iOS, resolve the issue with your Camera being blurry after updating, by working through these steps: 

“1. 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 to discuss service options.

2. Restart your iPhone, iPad, or iPod touch. 

3. 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 .”

If the camera or flash on your iPhone, iPad, or iPod touch isn't working - Apple Support

Should the issue continue, Contact Apple Support for more assistance. 

We hope this helps to further isolate and resolve the issue to get your Camera responding normally when asked.

Best wishes.