Zte N9517 User Manual page 56

CAUTION:
 The formatting procedure erases all the data on the
microSDXC card, after which the files CANNOT be retrieved.
As part of the internal storage, the microSDXC card may have

data on it that is necessary for some apps to function
normally. Therefore, do not remove or replace the card
randomly.
To reformat the microSDXC card as portable storage:
If you no longer want to use your microSDXC card as internal
storage, you can reformat the card as portable storage.
NOTE:
Before the formatting, ensure that you have moved data and
apps to the internal storage.
1. Tap the Home key >
2. Tap your card name below Device storage.
3. Tap Format as portable.
4. Tap FORMAT.
CAUTION:
The formatting procedure erases all the data on the microSDXC
card, after which files CANNOT be retrieved.
> Settings > Storage.
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