Aunque me duela decirlo, el único software que he encontrado para hacerlo es Premiere, mi experiencia fue esta, exporte desde Davinci .xml, importe con Premiere .xml "Premiere permite tener dos lineas de tiempo con diferente fps. copie la linea desde 25P a 50P y volví a exportar .xml y lo importe con Davinci "a mi me funciono"
Although it pains me to say it, the only software I have found to do it is Premiere, my experience was this, export from Davinci .xml, import with Premiere .xml "Premiere allows to have two timelines with different fps. Copy the line from 25P to 50P and I went back to export .xml and import it with Davinci "it worked for me"