diff --git a/lib/flash_internal.c b/lib/flash_internal.c
index e55fed6..90ef36c 100644
--- a/lib/flash_internal.c
+++ b/lib/flash_internal.c
@@ -93,7 +93,7 @@ bool flash_internal_write(uint32_t address, uint8_t *buffer, size_t size)
 
 	// get page size
 	uint16_t page_size = 0;
-	if ((0x412==(DBGMCU_IDCODE&DBGMCU_IDCODE_DEV_ID_MASK)) || (0x412==(DBGMCU_IDCODE&DBGMCU_IDCODE_DEV_ID_MASK))) { // low-density (16-32 KB flash) and medium-density (64-128 KB flash) devices have 1 KB flash pages
+	if ((0x410==(DBGMCU_IDCODE&DBGMCU_IDCODE_DEV_ID_MASK)) || (0x412==(DBGMCU_IDCODE&DBGMCU_IDCODE_DEV_ID_MASK))) { // low-density (16-32 KB flash) and medium-density (64-128 KB flash) devices have 1 KB flash pages
 		page_size = 1024;
 	} else if ((0x414==(DBGMCU_IDCODE&DBGMCU_IDCODE_DEV_ID_MASK)) || (0x430==(DBGMCU_IDCODE&DBGMCU_IDCODE_DEV_ID_MASK)) || (0x418==(DBGMCU_IDCODE&DBGMCU_IDCODE_DEV_ID_MASK))) { // high-density (256-512 KB flash), XL-density (768-1024 KB flash) devices and connectivity line have 2 KB flash pages
 		page_size = 2048;