diff --git a/BoardConfigCommon.mk b/BoardConfigCommon.mk
index 6af6df6..057705a 100644
--- a/BoardConfigCommon.mk
+++ b/BoardConfigCommon.mk
@@ -116,3 +116,6 @@ BOARD_INCLUDE_RECOVERY_DTBO := true
 TARGET_RECOVERY_PIXEL_FORMAT := "RGBX_8888"
 TARGET_USERIMAGES_USE_EXT4 := true
 TARGET_USERIMAGES_USE_F2FS := true
+
+# Releasetools
+TARGET_RELEASETOOLS_EXTENSIONS := $(COMMON_PATH)
diff --git a/releasetools.py b/releasetools.py
new file mode 100644
index 0000000..d5965db
--- /dev/null
+++ b/releasetools.py
@@ -0,0 +1,35 @@
+# Copyright (C) 2021 The LineageOS Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#      http://www.apache.org/licenses/LICENSE-2.0
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import common
+
+def FullOTA_InstallEnd(info):
+  OTA_InstallEnd(info)
+  return
+
+def IncrementalOTA_InstallEnd(info):
+  OTA_InstallEnd(info)
+  return
+
+def AddImage(info, basename, dest):
+  path = "IMAGES/" + basename
+  if path not in info.input_zip.namelist():
+    return
+
+  data = info.input_zip.read(path)
+  common.ZipWriteStr(info.output_zip, basename, data)
+  info.script.AppendExtra('package_extract_file("%s", "%s");' % (basename, dest))
+
+def OTA_InstallEnd(info):
+  info.script.Print("Patching firmware images...")
+  AddImage(info, "dtbo.img", "/dev/block/bootdevice/by-name/dtbo")
+  return