A novela oficial do filme indica que ele usou a Força
In the main holocomm center of the Jedi Temple, high atop the central spire, Obi-Wan used the Force to reach deep within the shell of the recall beacon’s mechanism, subtly altering the pulse calibration to flip the signal from come home to run and hide. Done without any visible alteration, it would take the troopers quite a while to detect the recalibration, and longer still to reset it. This was all that could be done for any surviving Jedi: a warning, to give them a fighting chance.
O romance júnior também implica que ele adicionou algumas proteções extras para evitar sua detecção.
Still, avoiding the clones took time. It was full night by the time they reached the main control center. Yoda stood guard while Obi-Wan reset the beacon and then added a few twists to hide what he had done. When Yoda gave him an impatient look, Obi-Wan explained, “I’ve recalibrated the code to warn any surviving Jedi away.” That was much better than simply disabling the beacon.
No entanto, aprendemos em Star Wars: Rebels que ele encontrou tempo para receber uma mensagem visual e de áudio mais longa para fugir de Jedi. Não é totalmente claro se isso foi incluído na mensagem do beacon ou de alguma forma enviado posteriormente.