How to set CRS in QGIS using pyQGIS

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This question is very similar to these one , but it's doesn't work for me. This is my try: ........

vlayer.setCrs(QgsCoordinateReferenceSystem(25830)) iface.mapCanvas().mapRenderer().setDestinationCrs(QgsCoordinateReferenceSystem(25830)) But the dialog pop up asking for CRS to choose, and when I ask for the CRS of the layer, it show a diferent CRS:

print "CRS: " + vlayer.crs().geographicCRSAuthId() It show CRS: EPSG:4258 and It must be 25830



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