If you wish to reset your mobile phone such as your Sony Xperia TIPO dual such as the Sony ST21i2 as well as the Sony ST21a2 then the instructions are below. The factory reset process for the Xperia phones are all the same that includes the codes, button sequence as well as by menu and software such as Xperia companion.
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Sony Xperia TIPO Dual Hard Reset
Please note that should you decide before you do a reset to the phone that you are best advised to backup all your data onto your computer. Once the reset occurs you cannot recover your settings or files. This can be done with Xperia Companion which you can use and it is on this websites.
Search this website for more reset codes.
Hard Reset will erase all of your data
All described operations you are doing at your own risk.
Hard Reset Sony Xperia TIPO Dual
Hard Reset Xperia TIPO Dual with the Menu
Hard Reset Xperia TIPO Dual by Code