I own the Xperia M5 but there is a break from the back
Does this stop water protection?
I can send a picture
Hi @AHMAD17
Welcome to the community 
This kind of physical damage could likely affect the IP rating of your device causing issues with the water resistance of your handset.
I would suggest contacting Local support to arrange an assessment and repair with an authorized service centre to keep your handset in a warrantable condition
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