fix display firmware load

+ add remark about test mode in README

README.md

@@ -145,7 +145,17 @@ which image?
 * remove the stick, power off/on (or do `sudo reboot now`)
 
 
-### e) Install Services
+### e) Install Display Firmware (control box only)
+
+display in test mode?
+- finish it by touching several times
+
+> cd boxtools
+> git pull
+> sudo python3 display.py fw_display.bin
+
+
+### f) Install Services
 
 login with root/FrappyLinse
 ```