The only person that can change the bond order is the magistrate judge who imposed it. If they have ordered "no bond", then they are being held until trial.
If you are referring to a "no cost bond", that is where the defendant can be released as personal recognizance/PR bonds or in some jurisdictions own recognizance/OR bonds. They function just as regular bonds do, with the defendant promising to attend all future court dates in exchange for release. The difference is that no “collateral” is put up by the defendant.
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