Stuck in Fastboot

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http://forum.xda-developers.com – Hi, I tried to flash JB from one of those http://forum.xda-developers.com/show....php?t=1936512 (on Windows with the motorola drivers), and since then the i does not go beyond the red M. I can still access the fastboot, but when doing manually "fastboot flash boot boot.img", the CMD prompt shows/ > sending 'boot' > okay > writing 'boot' > okay > finished And on the phone > Getvar max-download-size > Downloading ... > Flashing boot... and nothing else happens. Does anyone have a clue? thx (HowTos)