diff --git a/build.sh b/build.sh
index 4903cfc..b5d194e 100755
--- a/build.sh
+++ b/build.sh
@@ -11,9 +11,9 @@ export label=$3
 export title="UBL 2.4"
 export package=UBL-2.4
 export UBLversion=2.4
-export UBLstage=cs01
+export UBLstage=os
 export UBLprevStageVersion=2.4
-export UBLprevStage=csd02
+export UBLprevStage=cs01
 export UBLprevVersion=2.3
 export rawdir=raw
 export includeISO=false