When in Oppo Neo 3 R831K to be software related issues then you can use this guide because it is very simple to use and in this no need any box just download flash tool or stock ROM from the below link and you can do, if device in hardware related problem then cant use this guide because dead will be dead, first check in device which shorting or not first remove shorting, you can use this guide when your device in hang on logo, restarting, auto turn on internet connection, auto turn on wifi connection, auto apk installing, auto gone balance, pattern lock, screen lock etc these type and this is for everyone who new fresher technician or experience technician in android software related, before use remember of must be working well all are required which you can see in this method it below to be mention, different to be error when you try to flash or upgrade first of USB not recognized this error possible when micro USB not working, battery not charged, phone USB socket not working properly so if you fail with this method just write down your comment on below comment box i will soon possible to fix it, first take backup into device if live otherwise dead you cant take backup, this method use when device in dead condition also but must be in software problem in hardware device not be live.

If you want to repair your device, you can try to repair it. You have to charge your battery with any charger and charged it by 70%. Your data is very important for you so it is good to do a backup of your data it may consist like your contact details,your important messages, your emails or any other important thing which you feel to be the backup in your device. This backup can be done on another device. we have to do the backup because after a format of your device, all your data will be gone and it will not be recovered. For backup in other devices you can use other external device like your hard drive, sd card or any other suitable devices.
If you are doing by your own.do it at your own risk as we dont take any responsibility if your device is damaged

Required for Flash to Oppo Neo 3 R831K

• Oppo Neo 3 R831K Handset with good battery charged , may be charged up to 90% and do not try with low battery
• Oppo Neo 3 R831K Stock ROM it must be tested means working well | Download here
• Oppo Neo 3 R831K Flash tool | Download here
• Oppo Neo 3 R831K USB (Flashing) Driver | Download here
• Good Quality Micro USB Cable
• Computer or Laptop