Please remember, doing the hard reset for master format SONY XPERIA J (ST26i/ST26a) will delete and erase any important data and installed applications at SONY XPERIA J (ST26i/ST26a).
Always remember to do the backup first before performing the master reset.
Please follow this guide completely at your own risk.
You should not try to attempt these things if you are unaware of it.
But we're not just talking about updating your phone, we're talking about getting it in perfect working condition. Sony PC Companion is useful for keeping your contact book current and for making backup copies of your contacts, multimedia files and galleries, and text messages.
It includes various additional options, perhaps the most useful being a simple way to update the phone's operating system.
A couple of well-explained, easy-to-follow steps and you'll have your Sony Xperia in perfect condition and working better than ever.
Don't get lost in dense manuals to keep your Android in working order, download Sony PC Companion and let it do the heavy lifting for you.