Yes, I have a first gen kindle fire.
I kept on getting a corrupted KFU zip when I downloaded it. I thought I fixed it when a use a zip fixer tool.
I got the KFU from the guild from this forum.
All the version I download had the same problem when unzipping, corruption.
I am a noob at this since I never done this before, I wan to make this clear, so don't assume much when responding please.
I have eclipse and I have downloaded all the necessary files from the SDK manager and more since I use eclipse for college.
My computer uses windows 8.
I have a windows 7 vm.
I used the KFU on windows 8, I now realized I should have done it on the vm.
Before I tried to root it, I made a backuped all the files located within it.
Almost forgot to mention that it no longer goes past the kindle fire logo when I restart it.
I don't know if this is enough information, so feel free to ask anything.