EPF21B

Change-Id: I948a66b658a7712801db0c00a8d19aab2bb393eb
diff --git a/core/build_id.mk b/core/build_id.mk
index 138f0d3..fc6accb 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -19,5 +19,5 @@
 # (like "CRB01").  It must be a single word, and is
 # capitalized by convention.
 
-export BUILD_ID=EPF21
+export BUILD_ID=EPF21B