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A soft reset (powering the device off then back on) is similar to restarting a desktop computer and is one of the first steps in troubleshooting a device. In most cases, a soft reset won't affect data on the device, unless the battery is very low.
Power the device off.
Press and hold the Power button until "MiFi® Powering Off" appears on the display then release.
If unable to power the device off, remove then re-insert the battery.
Power the device on.
Press and hold the Power button until "MiFi®" appears on the display then release.