diff --git a/include/ps2000_internal.h b/include/ps2000_internal.h
index ae3bfbf..2e87190 100644
--- a/include/ps2000_internal.h
+++ b/include/ps2000_internal.h
@@ -45,6 +45,10 @@ typedef int32_t ps2000_status_t;
 #define PS2000_EEPROM_MAGIC           0x5053324BU
 #define PS2000_DRIVER_VERSION         "3.0.150.6187"
 
+/* USB endpoint addresses (from sub_4E3D9) */
+#define PS2000_USB_EP_IN              0x81U
+#define PS2000_USB_EP_OUT             0x01U
+
 /* Device variants (from sub_237C0 prologue: cmp eax, 4) */
 #define PS2000_DEVICE_VARIANT_2       2U
 #define PS2000_DEVICE_VARIANT_3       3U
@@ -159,6 +163,9 @@ typedef enum {
     PS2000_IO_CMD_ERASE_FLASH_PAGE,
     PS2000_IO_CMD_SELECT_CSN_SPI,
     PS2000_IO_CMD_CHECK_EMPTY_EEPROM,
+    PS2000_IO_CMD_READ_FLASH_PAGE,
+    PS2000_IO_CMD_PROTECT_FLASH,
+    PS2000_IO_CMD_CHECK_FLASH_AVAIL,
     PS2000_IO_CMD_WRITE_FLASH_PAGE,
     PS2000_IO_CMD_PACKET,
     PS2000_IO_CMD_FPGA_IO,