diff --git a/perl-xCAT/xCAT/FSPUtils.pm b/perl-xCAT/xCAT/FSPUtils.pm
index 8efc2296d..3feb9a790 100644
--- a/perl-xCAT/xCAT/FSPUtils.pm
+++ b/perl-xCAT/xCAT/FSPUtils.pm
@@ -351,6 +351,8 @@ sub fsp_api_action {
     my $install_dir = xCAT::Utils->getInstallDir();
     if( $action =~ /^(code_update|get_compatible_version_from_rpm)$/) { 
         $cmd = "$fsp_api -a $action -T $tooltype -t $type:$fsp_ip:$id:$node_name:$parameter -d $install_dir/packages_fw/";
+    } elsif($action =~ /^code_updateD$/) {
+        $cmd = "fsp_api -a code_update -D -T $tooltype -t $type:$fsp_ip:$id:$node_name:$parameter -d $install_dir/packages_fw/";
     } elsif($action =~ /^add_connection$/) {
     	$cmd = "$fsp_api -a $action -u $user -p $password -T $tooltype -t $type:$fsp_ip:$id:$node_name:";
     } elsif ($action =~ /^set_frame_number$/) { 
diff --git a/perl-xCAT/xCAT/FSPflash.pm b/perl-xCAT/xCAT/FSPflash.pm
index ac2a5b937..69e5b0abe 100644
--- a/perl-xCAT/xCAT/FSPflash.pm
+++ b/perl-xCAT/xCAT/FSPflash.pm
@@ -328,8 +328,10 @@ sub rflash {
            if($housekeeping =~ /^commit$/) { $action = "code_commit"}
            if($housekeeping =~ /^recover$/) { $action = "code_reject"}
            if($housekeeping =~ /^bpa_acdl$/) { $action = "acdl"}
-           if($activate =~ /^(disruptive|deferred)$/) { 
+           if($activate eq "disruptive") { 
                $action = "code_update";
+           } elsif ($activate eq "deferred") {
+               $action = "code_updateD";
            } elsif (exists($activate)){
                #if($activate =~ /^concurrent$/) {
                my $res = "\'$activate\' option not supported in FSPflash. Please use disruptive or deferred mode";