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Hello!!
Guys do you know how to reset the settings only on Xperia Z2?? I don't what anything to be erased or deleted permanently! Like in old Sony devices, you had a choice a hard reset and it will erase everything or just the settings na dnothing more
Hmm ok thank you!
Make sure to create backups for your files as uli mentioned.
Yeap I'll do 
Hi AlexMiG,
From memory there used to be a Settings reset within the Backup & reset section, however I believe it was removed from later android versions. You could always check as you may not be up to date yet.
Menu > Settings > Backup & reset > Settings Reset.
Otherwise follow through with there suggestions.