[Q] Help!!! I Have Rooting Problems

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http://forum.xda-developers.com – I have rooted a Kindle Fire (my own) before. A friend wanted me to root his. I tried a new method (Kindle Water.) But the application crashed now the Fire has the FIREFIREFIRE bootloader but nothing else. There is still root protection. What should i do to fully root this Kindle Fire. I have a Dell Optiplex GX270: Win XP, 1GB RAM, 80GB Hard drive, and 2.8GHz Pentium 4. I also have a Macbook Pro 13-inch Mid-2009, 2GB of RAM, 2.3? GHz Intel Core 2 Duo (The rooting machine) (HowTos)