diff --git a/target/product/fullmte.mk b/target/product/fullmte.mk
index d47c685..5726c06 100644
--- a/target/product/fullmte.mk
+++ b/target/product/fullmte.mk
@@ -20,7 +20,8 @@
 # For more details, see:
 # https://source.android.com/docs/security/test/memory-safety/arm-mte
 ifeq ($(filter memtag_heap,$(SANITIZE_TARGET)),)
-  SANITIZE_TARGET := $(strip $(SANITIZE_TARGET) memtag_heap memtag_stack)
+  # TODO(b/292478827): Re-enable memtag_stack when new toolchain rolls.
+  SANITIZE_TARGET := $(strip $(SANITIZE_TARGET) memtag_heap)
   SANITIZE_TARGET_DIAG := $(strip $(SANITIZE_TARGET_DIAG) memtag_heap)
 endif
 PRODUCT_PRODUCT_PROPERTIES += persist.arm64.memtag.default=sync
diff --git a/tools/overrideflags.sh b/tools/overrideflags.sh
index ff311dd..b8605dc 100755
--- a/tools/overrideflags.sh
+++ b/tools/overrideflags.sh
@@ -14,7 +14,7 @@
 # limitations under the License.
 
 
-source $(cd $(dirname $BASH_SOURCE) &> /dev/null && pwd)/../../make/shell_utils.sh
+source $(cd $(dirname $BASH_SOURCE) &> /dev/null && pwd)/../shell_utils.sh
 require_top
 
 function print_help() {
diff --git a/tools/releasetools/ota_from_target_files.py b/tools/releasetools/ota_from_target_files.py
index 7be9876..de0e187 100755
--- a/tools/releasetools/ota_from_target_files.py
+++ b/tools/releasetools/ota_from_target_files.py
@@ -995,7 +995,7 @@
   metadata = GetPackageMetadata(target_info, source_info)
   # Generate payload.
   payload = PayloadGenerator(
-      wipe_user_data=OPTIONS.wipe_user_data, minor_version=OPTIONS.force_minor_version, is_partial_update=OPTIONS.partial)
+      wipe_user_data=OPTIONS.wipe_user_data, minor_version=OPTIONS.force_minor_version, is_partial_update=OPTIONS.partial, spl_downgrade=OPTIONS.spl_downgrade)
 
   partition_timestamps_flags = []
   # Enforce a max timestamp this payload can be applied on top of.
diff --git a/tools/releasetools/ota_utils.py b/tools/releasetools/ota_utils.py
index 5c70223..6ca9d64 100644
--- a/tools/releasetools/ota_utils.py
+++ b/tools/releasetools/ota_utils.py
@@ -791,7 +791,7 @@
   SECONDARY_PAYLOAD_BIN = 'secondary/payload.bin'
   SECONDARY_PAYLOAD_PROPERTIES_TXT = 'secondary/payload_properties.txt'
 
-  def __init__(self, secondary=False, wipe_user_data=False, minor_version=None, is_partial_update=False):
+  def __init__(self, secondary=False, wipe_user_data=False, minor_version=None, is_partial_update=False, spl_downgrade=False):
     """Initializes a Payload instance.
 
     Args:
@@ -803,6 +803,7 @@
     self.wipe_user_data = wipe_user_data
     self.minor_version = minor_version
     self.is_partial_update = is_partial_update
+    self.spl_downgrade = spl_downgrade
 
   def _Run(self, cmd):  # pylint: disable=no-self-use
     # Don't pipe (buffer) the output if verbose is set. Let
@@ -912,13 +913,15 @@
            "--properties_file=" + properties_file]
     self._Run(cmd)
 
-    if self.secondary:
-      with open(properties_file, "a") as f:
-        f.write("SWITCH_SLOT_ON_REBOOT=0\n")
 
-    if self.wipe_user_data:
-      with open(properties_file, "a") as f:
+    with open(properties_file, "a") as f:
+      if self.wipe_user_data:
         f.write("POWERWASH=1\n")
+      if self.secondary:
+        f.write("SWITCH_SLOT_ON_REBOOT=0\n")
+      if self.spl_downgrade:
+        f.write("SPL_DOWNGRADE=1\n")
+
 
     self.payload_properties = properties_file