diff --git a/flash.sh b/flash.sh
--- a/flash.sh
+++ b/flash.sh
@@ -6,5 +6,5 @@
 
 # USB DFU:
 dfu-util -a 0 -d 0483:df11 -s 0x08000000:leave -D build/main.bin 
-sleep 1
+sleep 2
 dfu-util -a 1 -s 0x1FFFF800:8 -D optbytes.dat