Zte GRAND X4 User Manual page 66

To remove the microSDXC card from your phone:
If you need to remove the microSDXC card used as portable
storage while the phone is on, you must unmount it first.
1. Touch
2. Touch
section.
3. When the screen prompts the card is safely ejected, you can
now remove it from the phone.
To erase and format the microSDXC card:
1. Touch
2. Touch the card name in the Portable storage section.
3. Touch Format.
4. Touch ERASE & FORMAT.
CAUTION:
The formatting procedure erases all the data on the microSDXC
card, after which the files CANNOT be retrieved.
Set Up the microSDXC Card as Device
Storage
If your microSDXC card is new or doesn't have content you want
to keep, you can format the card and use it as part of the device
storage. If you move the microSDXC card to another device, it'll
be formatted before it can be used.
> Settings > Storage.
next to the card name in the Portable storage
> Settings > Storage.
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