If the software files is abnormal due to power problems and the NE is restart, then HARD_BAD or SWDL_CHGMNG_NOMATCH can be reported.
If this is happened:
1) Pull out the ISU2 board, and then restart the NE again, after the NE is in normal status both , then insert the ISU2 board again, to force the NE to re-copy the software files to the ISU2.
2) If the above method is not working we can re-install the software package to the NE by using the package loading method (as Upgrade operation).
3) Replace the ISU2.