diff --git a/boot/nxboot/loader/boot.c b/boot/nxboot/loader/boot.c
index 6de9659ac02..c4f936d233e 100644
--- a/boot/nxboot/loader/boot.c
+++ b/boot/nxboot/loader/boot.c
@@ -417,6 +417,7 @@ static int perform_update(struct nxboot_state *state, bool check_only)
           syslog(LOG_INFO, "Creating recovery image.\n");
           nxboot_progress(nxboot_progress_start, recovery_create);
           copy_partition(primary, recovery, state, false);
+          flash_partition_flush(recovery);
           nxboot_progress(nxboot_progress_end);
           nxboot_progress(nxboot_progress_start, validate_recovery);
           successful = validate_image(recovery);
@@ -444,6 +445,8 @@ static int perform_update(struct nxboot_state *state, bool check_only)
           nxboot_progress(nxboot_progress_start, update_from_update);
           if (copy_partition(update, primary, state, true) >= 0)
             {
+              flash_partition_flush(primary);
+
               /* Erase the first sector of update partition. This marks the
                * partition as updated so we don't end up in an update loop.
                * The sector is written back again during the image
@@ -884,7 +887,6 @@ int nxboot_perform_update(bool check_only)
   int ret;
   int primary;
   struct nxboot_state state;
-  struct nxboot_img_header header;
 
   ret = nxboot_get_state(&state);
   if (ret < 0)
@@ -908,9 +910,9 @@ int nxboot_perform_update(bool check_only)
         }
     }
 
-  /* Check whether there is a valid image in the primary slot. This just
-   * checks whether the header is valid, but does not calculate the CRC
-   * of the image as this would prolong the boot process.
+  /* Check whether there is a valid image in the primary slot. Validates
+   * both the header and the full image CRC to ensure integrity before
+   * booting.
    */
 
   primary = flash_partition_open(CONFIG_NXBOOT_PRIMARY_SLOT_PATH);
@@ -919,8 +921,7 @@ int nxboot_perform_update(bool check_only)
       return ERROR;
     }
 
-  get_image_header(primary, &header);
-  if (!validate_image_header(&header))
+  if (!validate_image(primary))
     {
       ret = ERROR;
     }
diff --git a/boot/nxboot/loader/flash.c b/boot/nxboot/loader/flash.c
index f1a3595737f..ab6a243202e 100644
--- a/boot/nxboot/loader/flash.c
+++ b/boot/nxboot/loader/flash.c
@@ -76,6 +76,26 @@ int flash_partition_open(const char *path)
   return fd;
 }
 
+/****************************************************************************
+ * Name: flash_partition_flush
+ *
+ * Description:
+ *   Flushes any buffered writes to the underlying storage. This ensures
+ *   data is physically committed to flash before the caller proceeds.
+ *
+ * Input parameters:
+ *   fd: Valid file descriptor.
+ *
+ * Returned Value:
+ *   0 on success, -1 on failure.
+ *
+ ****************************************************************************/
+
+int flash_partition_flush(int fd)
+{
+  return fsync(fd);
+}
+
 /****************************************************************************
  * Name: flash_partition_close
  *
diff --git a/boot/nxboot/loader/flash.h b/boot/nxboot/loader/flash.h
index ef1dee09d06..69906490d23 100644
--- a/boot/nxboot/loader/flash.h
+++ b/boot/nxboot/loader/flash.h
@@ -79,6 +79,22 @@ int flash_partition_open(const char *path);
 
 int flash_partition_close(int fd);
 
+/****************************************************************************
+ * Name: flash_partition_flush
+ *
+ * Description:
+ *   Flushes any buffered writes to the underlying storage.
+ *
+ * Input parameters:
+ *   fd: Valid file descriptor.
+ *
+ * Returned Value:
+ *   0 on success, -1 on failure.
+ *
+ ****************************************************************************/
+
+int flash_partition_flush(int fd);
+
 /****************************************************************************
  * Name: flash_partition_write
  *