My device too having the same problem. After upgrade Ringtone volume is not audible. Its waste have this conversation with SONY Support. only thing that we can say is it completely waste of spending thousands of rupees on the brand "SONY". I will never buy SONY again, and would like to give a mouth publicity as its a worst product. What ever might be the issue, The only solution they have is "try a Factory restore", do they think its an easy job to do a factory reset of a mobile now a days, its all mobile. Thank you very much SONY for selling a best Garbage.
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