I need help desperately

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http://forum.xda-developers.com – When i tried to root my nook tablet 8gb, i made a big mistake; instead of formatting the external SD, I format the internal memory, so when i turn on the nook tablet, it just freezes on a black screen with the nook logo. what shall i do????????????!!!! :crying::crying::crying: Please help and thank you in advance (HowTos)