Samsung SM-G900F ユーザーズマニュアル

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Device & data manager
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Performing a data reset
Delete all settings and data on the device. Before performing a factory data reset, ensure you 
back up all important data stored on the device. Refer t
 for 
details.
Tap Settings on the Apps screen.
Tap Backup and reset 
→ Factory data reset.
Tap Reset device 
→ Erase everything.
The device automatically restarts.