Huawei Honor 7X User Manual page 52

Not all microSD cards can be encrypted. An error message may be displayed when you
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attempt to encrypt or unlock unsupported cards. Remember to back up important data
before encrypting your microSD card.
Encrypted microSD cards will not be recognised by devices that do not support microSD
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card encryption.
If you forget the microSD card password, you will have to clear all the data on the card.
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Not all devices support microSD cards.
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Open Settings.
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Touch Security & privacy > Additional settings > Set SD card password and follow
onscreen instructions to set a password.
Once you have set your password, you can change or remove the password:
Touch Change SD card password to change the password.
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Touch Clear SD card password to remove the microSD card password and disable
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encryption.
Security and Backup
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