diff --git a/lib_xua/lib_xua/src/dfu/flash_interface.c b/lib_xua/lib_xua/src/dfu/flash_interface.c
index a41de88..3b12ebb 100644
--- a/lib_xua/lib_xua/src/dfu/flash_interface.c
+++ b/lib_xua/lib_xua/src/dfu/flash_interface.c
@@ -23,7 +23,7 @@
  */
 #ifndef FLASH_MAX_UPGRADE_SIZE
 //#define FLASH_MAX_UPGRADE_SIZE (512 * 1024)
-#define FLASH_MAX_UPGRADE_SIZE (1024 * 1024)
+#define FLASH_MAX_UPGRADE_SIZE (0x1a0000)
 #endif
 
 #define FLASH_ERROR() do {} while(0)