I got a reply from social-care today, are they right?
"Thanks for reaching out to us. We apologize for the delayed response, but to answer your question, if you perform a factory reset on your Airave, yes it will delete that setting, but if you perform a soft reset (meaning plugging the Airave out for one minute) it will not erase that setting.
Please let us know if this answers your question?
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Sprint Social Media Care"