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Sibce thetupdate, ive been unable to connect to ant wifi whatsoever. All the connections I've had in the past are never found. Just non stop searching to no avail
it'll be wise to repair the phone with XC
Alternatives on How to backup Xperias
And if you're afraid to do the Xperia Companion repair, then you could start with resetting the router.
On your phone you can reset network settings or 'forget' the networks to which you cannot connect.