You must give the full history of what happened so we can assist properly. Please read this and then supply all information asked in post #1: [Only registered and activated users can see links. ]. Additionally, please state clearly why you've downgraded to such an old beta version. Beta firmwares are often incomplete or buggy. Also, did you try entering preboot by holding 'Enter' button instead of 'Up' and also by powering on manually as i suggested, if it doesn't liven up after connecting USB? Also what do you mean 'flash fw by updater'? Updater.exe is only usable in preboot.