The version earlier than V8R8C01, OLT don't support to replace GPBC
board with GPBD boarddirectly, so need to delete the configuration
on the board, and then delete the board. after clear the old
configuration, you can replace the GPBD board"
If the current version is V8R8C01 or later, the GPBC board can be
replaced directly to GPBD board without to delete and re-create any