diff --git a/16kb/16kb.mk b/16kb/16kb.mk
new file mode 100644
index 0000000..96bfd89
--- /dev/null
+++ b/16kb/16kb.mk
@@ -0,0 +1,22 @@
+#
+# Copyright (C) 2025 The Android Open-Source 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.
+#
+
+#######################################################################
+# WARNING: Any rule defined here automatically gets inherited for
+# *BOTH* 4 KB and 16 KB targets where this file is included.
+#######################################################################
+
+PRODUCT_PACKAGES += copy_efs_files_to_data
diff --git a/16kb/Android.bp b/16kb/Android.bp
new file mode 100644
index 0000000..e9bd6ac
--- /dev/null
+++ b/16kb/Android.bp
@@ -0,0 +1,13 @@
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+// Filesystem: Copy efs/efs_backup/modem_userdata to /data partition
+// so that they can be accessed under 16K mode. By default, these partitions
+// are 4K F2FS , which can't be mounted under 16K mode.
+// (b/293313353)
+sh_binary {
+    name: "copy_efs_files_to_data",
+    src: "copy_efs_files_to_data.sh",
+    vendor: true,
+}
diff --git a/16kb/copy_efs_files_to_data.sh b/16kb/copy_efs_files_to_data.sh
new file mode 100644
index 0000000..e1d2204
--- /dev/null
+++ b/16kb/copy_efs_files_to_data.sh
@@ -0,0 +1,39 @@
+#!/vendor/bin/sh
+
+CHECKPOINT_DIR=/data/vendor/copied
+
+export BIN_DIR=/vendor/bin
+
+$BIN_DIR/mkdir -p $CHECKPOINT_DIR
+
+function copy_files_to_data()
+{
+  block_device=$1
+  partition_name=$(basename $1)
+  mount_point=$2
+  tmpdir=$CHECKPOINT_DIR/$partition_name.img
+  build_checkpoint=$CHECKPOINT_DIR/$partition_name
+  if [ ! -e $build_checkpoint ]; then
+    $BIN_DIR/rm -rf $tmpdir
+    $BIN_DIR/mkdir -p $tmpdir
+    $BIN_DIR/dump.f2fs -rfPLo $tmpdir $block_device
+    if [ $? -ne 0 ]; then
+      echo "Failed to $BIN_DIR/dump.f2fs -rfPLo $tmpdir $block_device"
+      return
+    fi
+    $BIN_DIR/mv $tmpdir $build_checkpoint
+    if [ $? -ne 0 ]; then
+      echo "mv $tmpdir $build_checkpoint"
+      return
+    fi
+    $BIN_DIR/fsync `dirname $build_checkpoint`
+  fi
+  echo "Successfully copied $mount_point to $build_checkpoint"
+}
+
+copy_files_to_data "/dev/block/by-name/efs" "/mnt/vendor/efs"
+copy_files_to_data "/dev/block/by-name/efs_backup" "/mnt/vendor/efs_backup"
+copy_files_to_data "/dev/block/by-name/modem_userdata" "/mnt/vendor/modem_userdata"
+copy_files_to_data "/dev/block/by-name/persist" "/mnt/vendor/persist"
+
+$BIN_DIR/fsync /data/vendor/copied