[Oppo R831K] stuck on logo after factory reset - Android Q&A, Help & Troubleshooting

I was facing a bootloop problem so I tried to restore the backup but an error occurred "failed restore/system!". I tried to factory reset my phone but it's not boot beyond logo screen. Using CWM v5.5.0.4

Im sorry but the the only thing to do now is to go back to the official firmware

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