--- a/eric6/MicroPython/EspBackupRestoreFirmwareDialog.py	Mon Mar 01 17:48:43 2021 +0100
+++ b/eric6/MicroPython/EspBackupRestoreFirmwareDialog.py	Tue Mar 02 17:17:09 2021 +0100
@@ -95,7 +95,8 @@
             enable &= bool(self.sizeComboBox.currentText())
         else:
             enable &= os.path.exists(firmwareFile)
-        self.buttonBox.button(QDialogButtonBox.Ok).setEnabled(enable)
+        self.buttonBox.button(
+            QDialogButtonBox.StandardButton.Ok).setEnabled(enable)
     
     @pyqtSlot(str)
     def on_espComboBox_currentTextChanged(self, chip):