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Base64.decodestring has been deprecated since 3.1 and removed in python 3.9, Replace it with base64.decodebytes from python3.1[1]. [1]https://docs.python.org/3.9/library/base64.html?highlight=deprecated#base64.decodebytes Change-Id: Ic5ae225d5cd8fefd70d3620518f19f16147135df