You can perform a factory reset with the SMS Utilities <b>restore</b> rule. If the rule hasn't been disabled or changed in any way, all you need to do is send an SMS message to the router containing the text:
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<b><router_password> restore</b>
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Replace <i><router_password></i> with your actual password. {{#ifeq:{{{series}}}|TRB14x||You can find more information on SMS Utilities rules <b>[[{{{name}}} SMS Utilities|here]]</b>.}}