diff --git a/CleanSpec.mk b/CleanSpec.mk
index 043fd8a..a55b241 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -163,6 +163,11 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/EXECUTABLES)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/lib/*.o)
 
+# Wait, back to some JB development!
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/build.prop)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/*)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/APPS/*)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 56860d8..ceb550f 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -41,7 +41,7 @@
   # which is the version that we reveal to the end user.
   # Update this value when the platform version changes (rather
   # than overriding it somewhere else).  Can be an arbitrary string.
-  PLATFORM_VERSION := K
+  PLATFORM_VERSION := JellyBeanMR2
 endif
 
 ifeq "" "$(PLATFORM_SDK_VERSION)"
@@ -59,7 +59,7 @@
 ifeq "" "$(PLATFORM_VERSION_CODENAME)"
   # This is the current development code-name, if the build is not a final
   # release build.  If this is a final release build, it is simply "REL".
-  PLATFORM_VERSION_CODENAME := K
+  PLATFORM_VERSION_CODENAME := JellyBeanMR2
 endif
 
 ifeq "" "$(DEFAULT_APP_TARGET_SDK)"