--- a/eric7/WebBrowser/UserAgent/UserAgentWriter.py	Sun Aug 29 17:48:26 2021 +0200
+++ b/eric7/WebBrowser/UserAgent/UserAgentWriter.py	Sun Aug 29 17:48:44 2021 +0200
@@ -36,7 +36,7 @@
             f = fileNameOrDevice
         else:
             f = QFile(fileNameOrDevice)
-            if not f.open(QFile.WriteOnly):
+            if not f.open(QIODevice.OpenModeFlag.WriteOnly):
                 return False
         
         self.setDevice(f)