Boston Scientific Corporation is initiating an advisory to inform customers that if limited supply of model 3300 latitude programmers exists locally, Boston Scientific recommends continued use of older model 3120 zoom programmers. Consequently, users may observe some unanticipated behaviors not described in labeling if certain transvenous (tv) defibrillators are interrogated with outdated model 2868 software on 3120 zoom programmers. The purpose of this letter is to describe potential interactions between tv defibrillators and the 2868 software installed on 3120 zoom programmers. These potential interactions do not alter tv defibrillation operation or programming. Recall start date: July 7, 2022