diff --git a/uncrypt/Android.mk b/uncrypt/Android.mk
index 09cfdfc..6422cb2 100644
--- a/uncrypt/Android.mk
+++ b/uncrypt/Android.mk
@@ -15,15 +15,6 @@
 LOCAL_PATH := $(call my-dir)
 
 include $(CLEAR_VARS)
-LOCAL_CLANG := true
-LOCAL_SRC_FILES := bootloader_message_writer.cpp
-LOCAL_MODULE := libbootloader_message_writer
-LOCAL_STATIC_LIBRARIES := libbase libfs_mgr
-LOCAL_C_INCLUDES := $(LOCAL_PATH)/..
-LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/include
-include $(BUILD_STATIC_LIBRARY)
-
-include $(CLEAR_VARS)
 
 LOCAL_CLANG := true
 
@@ -33,8 +24,7 @@
 
 LOCAL_MODULE := uncrypt
 
-LOCAL_STATIC_LIBRARIES := libbootloader_message_writer libbase \
-                          liblog libfs_mgr libcutils \
+LOCAL_STATIC_LIBRARIES := libbase liblog libfs_mgr libcutils
 
 LOCAL_INIT_RC := uncrypt.rc
 
diff --git a/uncrypt/bootloader_message_writer.cpp b/uncrypt/bootloader_message_writer.cpp
deleted file mode 100644
index 3bb106a..0000000
--- a/uncrypt/bootloader_message_writer.cpp
+++ /dev/null
@@ -1,107 +0,0 @@
-/*
- * Copyright (C) 2016 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.
- */
-
-#include <errno.h>
-#include <fcntl.h>
-#include <string.h>
-#include <sys/system_properties.h>
-
-#include <string>
-#include <vector>
-
-#include <android-base/file.h>
-#include <android-base/stringprintf.h>
-#include <android-base/unique_fd.h>
-#include <fs_mgr.h>
-
-#include "bootloader.h"
-
-static struct fstab* read_fstab(std::string* err) {
-  // The fstab path is always "/fstab.${ro.hardware}".
-  std::string fstab_path = "/fstab.";
-  char value[PROP_VALUE_MAX];
-  if (__system_property_get("ro.hardware", value) == 0) {
-    *err = "failed to get ro.hardware";
-    return nullptr;
-  }
-  fstab_path += value;
-  struct fstab* fstab = fs_mgr_read_fstab(fstab_path.c_str());
-  if (fstab == nullptr) {
-    *err = "failed to read " + fstab_path;
-  }
-  return fstab;
-}
-
-static std::string get_misc_blk_device(std::string* err) {
-  struct fstab* fstab = read_fstab(err);
-  if (fstab == nullptr) {
-    return "";
-  }
-  fstab_rec* record = fs_mgr_get_entry_for_mount_point(fstab, "/misc");
-  if (record == nullptr) {
-    *err = "failed to find /misc partition";
-    return "";
-  }
-  return record->blk_device;
-}
-
-static bool write_bootloader_message(const bootloader_message& boot, std::string* err) {
-  std::string misc_blk_device = get_misc_blk_device(err);
-  if (misc_blk_device.empty()) {
-    return false;
-  }
-  android::base::unique_fd fd(open(misc_blk_device.c_str(), O_WRONLY | O_SYNC));
-  if (fd.get() == -1) {
-    *err = android::base::StringPrintf("failed to open %s: %s", misc_blk_device.c_str(),
-                                       strerror(errno));
-    return false;
-  }
-  if (!android::base::WriteFully(fd.get(), &boot, sizeof(boot))) {
-    *err = android::base::StringPrintf("failed to write %s: %s", misc_blk_device.c_str(),
-                                       strerror(errno));
-    return false;
-  }
-  // TODO: O_SYNC and fsync duplicates each other?
-  if (fsync(fd.get()) == -1) {
-    *err = android::base::StringPrintf("failed to fsync %s: %s", misc_blk_device.c_str(),
-                                       strerror(errno));
-    return false;
-  }
-  return true;
-}
-
-bool clear_bootloader_message(std::string* err) {
-  bootloader_message boot = {};
-  return write_bootloader_message(boot, err);
-}
-
-bool write_bootloader_message(const std::vector<std::string>& options, std::string* err) {
-  bootloader_message boot = {};
-  strlcpy(boot.command, "boot-recovery", sizeof(boot.command));
-  strlcpy(boot.recovery, "recovery\n", sizeof(boot.recovery));
-  for (const auto& s : options) {
-    strlcat(boot.recovery, s.c_str(), sizeof(boot.recovery));
-    if (s.back() != '\n') {
-      strlcat(boot.recovery, "\n", sizeof(boot.recovery));
-    }
-  }
-  return write_bootloader_message(boot, err);
-}
-
-extern "C" bool write_bootloader_message(const char* options) {
-  std::string err;
-  return write_bootloader_message({options}, &err);
-}
diff --git a/uncrypt/include/bootloader_message_writer.h b/uncrypt/include/bootloader_message_writer.h
deleted file mode 100644
index e0ca3f4..0000000
--- a/uncrypt/include/bootloader_message_writer.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/*
- * Copyright (C) 2016 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.
- */
-
-#ifndef BOOTLOADER_MESSAGE_WRITER_H
-#define BOOTLOADER_MESSAGE_WRITER_H
-
-#ifdef __cplusplus
-#include <string>
-#include <vector>
-
-bool clear_bootloader_message(std::string* err);
-
-bool write_bootloader_message(const std::vector<std::string>& options, std::string* err);
-
-#else
-#include <stdbool.h>
-
-// C Interface.
-bool write_bootloader_message(const char* options);
-#endif
-
-#endif  // BOOTLOADER_MESSAGE_WRITER_H
diff --git a/uncrypt/uncrypt.cpp b/uncrypt/uncrypt.cpp
index d7105a0..2ef0935 100644
--- a/uncrypt/uncrypt.cpp
+++ b/uncrypt/uncrypt.cpp
@@ -109,7 +109,6 @@
 #include <android-base/logging.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
-#include <bootloader_message_writer.h>
 #include <cutils/android_reboot.h>
 #include <cutils/properties.h>
 #include <cutils/sockets.h>
@@ -118,6 +117,7 @@
 #define LOG_TAG "uncrypt"
 #include <log/log.h>
 
+#include "bootloader.h"
 #include "unique_fd.h"
 
 #define WINDOW_SIZE 5
@@ -414,6 +414,40 @@
     return 0;
 }
 
+static std::string get_misc_blk_device() {
+    if (fstab == nullptr) {
+        return "";
+    }
+    struct fstab_rec* rec = fs_mgr_get_entry_for_mount_point(fstab, "/misc");
+    if (rec != nullptr) {
+        return rec->blk_device;
+    }
+    return "";
+}
+
+static int write_bootloader_message(const bootloader_message* in) {
+    std::string misc_blk_device = get_misc_blk_device();
+    if (misc_blk_device.empty()) {
+        ALOGE("failed to find /misc partition.");
+        return -1;
+    }
+    unique_fd fd(open(misc_blk_device.c_str(), O_WRONLY | O_SYNC));
+    if (!fd) {
+        ALOGE("failed to open %s: %s", misc_blk_device.c_str(), strerror(errno));
+        return -1;
+    }
+    if (!android::base::WriteFully(fd.get(), in, sizeof(*in))) {
+        ALOGE("failed to write %s: %s", misc_blk_device.c_str(), strerror(errno));
+        return -1;
+    }
+    // TODO: O_SYNC and fsync() duplicates each other?
+    if (fsync(fd.get()) == -1) {
+        ALOGE("failed to fsync %s: %s", misc_blk_device.c_str(), strerror(errno));
+        return -1;
+    }
+    return 0;
+}
+
 static int uncrypt(const char* input_path, const char* map_file, const int socket) {
     ALOGI("update package is \"%s\"", input_path);
 
@@ -476,9 +510,8 @@
 }
 
 static bool clear_bcb(const int socket) {
-    std::string err;
-    if (!clear_bootloader_message(&err)) {
-        ALOGE("failed to clear bootloader message: %s", err.c_str());
+    bootloader_message boot = {};
+    if (write_bootloader_message(&boot) != 0) {
         write_status_to_socket(-1, socket);
         return false;
     }
@@ -505,9 +538,12 @@
     ALOGI("  received command: [%s] (%zu)", content.c_str(), content.size());
 
     // c8. setup the bcb command
-    std::string err;
-    if (!write_bootloader_message({content}, &err)) {
-        ALOGE("failed to set bootloader message: %s", err.c_str());
+    bootloader_message boot = {};
+    strlcpy(boot.command, "boot-recovery", sizeof(boot.command));
+    strlcpy(boot.recovery, "recovery\n", sizeof(boot.recovery));
+    strlcat(boot.recovery, content.c_str(), sizeof(boot.recovery));
+    if (write_bootloader_message(&boot) != 0) {
+        ALOGE("failed to set bootloader message");
         write_status_to_socket(-1, socket);
         return false;
     }