diff --git a/flash.sh b/flash.sh
--- a/flash.sh
+++ b/flash.sh
@@ -1,8 +1,10 @@
 #!/bin/bash
-cd build
-st-flash write main.bin 0x8000000
-cd ..
+#cd build
+#st-flash write main.bin 0x8000000
+#cd ..
 
 
 # USB DFU:
-# sudo  dfu-util -a 0 -d 0483:df11 -s 0x08000000:leave -D build/main.bin
+dfu-util -a 0 -d 0483:df11 -s 0x08000000:leave -D build/main.bin 
+sleep 1
+dfu-util -a 1 -s 0x1FFFF800:8 -D optbytes.dat