The iManager CMF (DC) V100R003C00SPC101 is one of the helpful tool to upgrades NEs in different domains following different procedures. Generally, users upgrade NEs in the same domain at a time. To facilitate NE upgrade in the DC, the DC login window allows users to select NE domains. Only NEs in the selected domain and the corresponding function sets are displayed during the upgrade. So during the upgrade from RTN 950 V100R002C00SPC100 (5.76.02.10) to RTN 950 V100R003C00SPC100 (5.76.02.12), the customer observed an error Normal-Unstable NE, which stopped the upgrading operation.