LG G5 ユーザーガイド

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Basic Functions
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Precautions for device encryption
You can use the mobile phone lock on the lock screen to increase your 
device's protection level.
If the mobile phone lock is turned on and an incorrect password 
is entered more than a specified number of times, the device will 
automatically initialise.
If you forget your decryption password, you must initialise the device to 
use it again. Initialisation will delete all data saved before initialisation.
Encryption takes place when the device boots for the first time after a 
factory reset. Stopping encryption before it is complete may damage 
data. For example, do not remove or insert the battery while encryption 
is in progress. Wait until the process is complete.
Memory card encryption
You can encrypt and protect data saved on the memory card. The 
encrypted data in the memory card cannot be accessed from another 
device.
Tap     
Settings   General   Fingerprints & security   Encrypt SD 
card storage.
Read the on-screen overview of memory card encryption and then 
tap 
CONTINUE to continue.
Select an option and tap 
ENCRYPT NOW:
New data encryption: Encrypt only data that is saved on the 
memory card after encryption.
Full encryption: Encrypt all the data currently saved on the 
memory card.
Exclude media files: Encrypt all files, except for media files such as 
music, photos and videos.