ShellShock, the Universal Flasher autorun.xml method works only on: 300, 500, 505 models.
Afaik from porkupan (aka boroda) 650 is very similar to 900, so the "old" 900 hack should work. You can find his 900 flasher
here.
PS
Be careful not to brick your reader!

In case of 650, however, there should be a way to restore it using memory stick.