NETGEAR Nighthawk M1 MR1100 AC1000 Wireless Dual-Band Gigabit Mobile Router - Manual (Page 58)

Micro SD Card Requirements
The mobile router supports SD cards up to 128 GB in the following formats: FAT, FAT-16, FAT-32, NTFS,
HFS, and HFS+.
For information about how to format a USB storage device using a computer or other
device, consult the instructions that came with your computer or device. Note
Formatting the USB storage device erases all data on the device.
Install a Micro SD Card
Micro SD cards are sold separately.
To install the micro SD card:
1. Obtain a micro SD card (sold separately).
2. Make sure that power to the mobile router is off.
3. Remove the cover on the bottom of the mobile router.
Place your thumbs on the arrows on the cover and press down while sliding the cover up.
Share Media and Storage
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Nighthawk LTE Mobile Hotspot Router Model MR1100