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I don't use antivirus on my phone as it slows down (my phone) and drains my battery faster
Bridge (for Mac)
Alternatives on How to backup Xperias
Do you have a Mac?
On a tablet try to access
myxperia.sonymobile.com
and you could reset your phone.
Perhaps you went to a website and you have
settings > security > unknown sources and it was installed.
There is a photo editor app now built into the Album app and then there's an alternative with different options from Sony available from the Play store