diff --git a/Android.mk b/Android.mk
index 8189ffa..d6a318b 100644
--- a/Android.mk
+++ b/Android.mk
@@ -602,10 +602,6 @@
     LOCAL_CFLAGS += -DAB_OTA_UPDATER=1
 endif
 
-ifneq ($(BOARD_RECOVERY_BLDRMSG_OFFSET),)
-    LOCAL_CFLAGS += -DBOARD_RECOVERY_BLDRMSG_OFFSET=$(BOARD_RECOVERY_BLDRMSG_OFFSET)
-endif
-
 include $(BUILD_SHARED_LIBRARY)
 
 # All the APIs for testing
diff --git a/bootloader_message/bootloader_message.cpp b/bootloader_message/bootloader_message.cpp
index 4d1ce5b..449f40e 100644
--- a/bootloader_message/bootloader_message.cpp
+++ b/bootloader_message/bootloader_message.cpp
@@ -159,7 +159,10 @@
     *err = "no misc device set";
     return false;
   }
-  int fd = (open(misc_blk_device.c_str(), O_WRONLY | O_SYNC));
+  int open_flags = O_WRONLY | O_SYNC;
+  if (offset > 0)
+    open_flags = O_RDWR | O_APPEND | O_SYNC;
+  int fd = (open(misc_blk_device.c_str(), open_flags));
   if (fd == -1) {
     *err = "failed to open " + misc_blk_device + ": ";
     *err += strerror(errno);
diff --git a/bootloader_message/include/bootloader_message/bootloader_message.h b/bootloader_message/include/bootloader_message/bootloader_message.h
index 52d7331..e0fc2cd 100644
--- a/bootloader_message/include/bootloader_message/bootloader_message.h
+++ b/bootloader_message/include/bootloader_message/bootloader_message.h
@@ -25,8 +25,13 @@
 // 16K - 64K    Used by uncrypt and recovery to store wipe_package for A/B devices
 // Note that these offsets are admitted by bootloader,recovery and uncrypt, so they
 // are not configurable without changing all of them.
+#ifdef BOARD_RECOVERY_BLDRMSG_OFFSET
+static const size_t BOOTLOADER_MESSAGE_OFFSET_IN_MISC = BOARD_RECOVERY_BLDRMSG_OFFSET;
+static const size_t WIPE_PACKAGE_OFFSET_IN_MISC = 16 * 1024 + BOOTLOADER_MESSAGE_OFFSET_IN_MISC;
+#else
 static const size_t BOOTLOADER_MESSAGE_OFFSET_IN_MISC = 0;
 static const size_t WIPE_PACKAGE_OFFSET_IN_MISC = 16 * 1024;
+#endif
 
 /* Bootloader Message
  *
diff --git a/updater/install.cpp b/updater/install.cpp
index b17c34f..d4ae64e 100644
--- a/updater/install.cpp
+++ b/updater/install.cpp
@@ -1456,6 +1456,7 @@
     memset(buffer, 0, sizeof(((struct bootloader_message*)0)->command));
     FILE* f = fopen(filename, "r+b");
     fseek(f, offsetof(struct bootloader_message, command), SEEK_SET);
+    fseek(f, BOOTLOADER_MESSAGE_OFFSET_IN_MISC, SEEK_CUR);
     ota_fwrite(buffer, sizeof(((struct bootloader_message*)0)->command), 1, f);
     fclose(f);
     free(filename);
@@ -1498,6 +1499,7 @@
     // package installation.
     FILE* f = fopen(filename, "r+b");
     fseek(f, offsetof(struct bootloader_message, stage), SEEK_SET);
+    fseek(f, BOOTLOADER_MESSAGE_OFFSET_IN_MISC, SEEK_CUR);
     int to_write = strlen(stagestr)+1;
     int max_size = sizeof(((struct bootloader_message*)0)->stage);
     if (to_write > max_size) {
@@ -1524,6 +1526,7 @@
     char buffer[sizeof(((struct bootloader_message*)0)->stage)];
     FILE* f = fopen(filename, "rb");
     fseek(f, offsetof(struct bootloader_message, stage), SEEK_SET);
+    fseek(f, BOOTLOADER_MESSAGE_OFFSET_IN_MISC, SEEK_CUR);
     ota_fread(buffer, sizeof(buffer), 1, f);
     fclose(f);
     buffer[sizeof(buffer)-1] = '\0';