I'm trying to iterate through all the features of a layer to change the value of some of its attributes. I'm using the following code:

from qgis.core import *
import os

working_folder = r'C:\myFolder'
fc_Opt_Prospect = os.path.join(working_folder, 'Equipm.gdb|layername=Prosp')

layer = QgsVectorLayer(fc_Opt_Prospect, 'Optimity_Prospect', 'ogr')

layer.startEditing()

for f in layer.getFeatures():
    layer.changeAttributeValue(f.id(), 4, 3)
    layer.changeAttributeValue(f.id(), 5, 6)

layer.commitChanges()
QgsProject.instance().addMapLayer(layer)

When I check the attribute table of the layer I can see that no value has been changed. No error is thrown by the script.