You're probably using Windows. No need to use sudo there, just make sure your user has admin privileges and type: Code: flasher-3.5.exe --enable-rd-mode Your own user password (the one you use to log-on to your computer). Alternatively instead of using sudo you can switch to root using any means possible then just type Code: flasher --enable-rd-mode
flasher-3.5.exe --enable-rd-mode
flasher --enable-rd-mode