diff --git a/Makefile b/Makefile
index 85bc27a9..ab3a47f7 100644
--- a/Makefile
+++ b/Makefile
@@ -170,7 +170,14 @@ flash:
 ifndef PDIR
 	$(MAKE) -C ./app flash
 else
-	$(ESPTOOL) --port $(ESPPORT) write_flash 0x00000 $(FIRMWAREDIR)0x00000.bin 0x10000 $(FIRMWAREDIR)0x10000.bin
+	$(ESPTOOL) --port $(ESPPORT) write_flash 0x00000 $(FIRMWAREDIR)0x00000.bin 0x10000 $(FIRMWAREDIR)0x10000.bin || ($(MAKE) flash_USB1; exit 1)
+endif
+
+flash_USB1: 
+ifndef PDIR
+	$(MAKE) -C ./app flash
+else
+	$(ESPTOOL) --port /dev/ttyUSB1 write_flash 0x00000 $(FIRMWAREDIR)0x00000.bin 0x10000 $(FIRMWAREDIR)0x10000.bin
 endif
 
 .subdirs: