Why does the “sof2flash” command not working in Quartus II 12.1 sp1 for Cyclone II?

Description

Due to a problem in the Quartus II software version 12.1 SP1,  sof2flash may fail for Nios II projects targeting Cyclone II devices using  EPCS.

Resolution

This problem has been fixed for the Quartus II software version beginning 13.0.