and I want to make it a normal Kindle Fire HD. I know I need to root to get rid of the demo software but I want to put the real FireOS on it and have it update normally so how would I go about unrooting it, or do I even have to unroot?
Um if it's a demo unit then it is not rooted, its on it's own demo os, you will need a fastboot cable to get it into fastboot mode so you can flash a normal os onto it. The normal os that get's flashed onto it comes prerooted because in order to make a system image we need root, hence it's got the su binary in the system image. I personally recommend installing a cm based os and 2nd bootloader afterwards if this is a 2012 model(has a camera), the amazon os is kinda limited capability wise.
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I have he er had to use any of the utilities to restore a kindle though I vaguely remember there being a long lost of instructions on kffa's post to do before using it, if you haven't done so then follow the directions, or just try kindle fire system restore tool. http://xdaforums.com/showthread.php?t=1951254
Ignore the part on srt's page about the adb command, that's only for if you don't have a fastboot cable and you have adb access.
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Check the device manager for a device with a yellow triangle next to it, if you find it then download the drivers in my signature and unzip them somewhere, then in the device manager right click the device with yellow triangle, hit update drivers, point it to where my drivers are and you should be set.
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Your recovery software wasn't extracted completely? That error means the fastboot command wasn't ran because windows couldn't find the file specified. If you were running kffa without extracting it that would explain it.
As for the not showing up part, it should show up as a adb device when it is in fastboot. You can always try switching to a normal cable once it is in fastboot. I would try getting the command working first in case its showing up and you aren't seeing it since the command would.
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You can extract kffa wherever you want.
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OK just want to verify, you extracted everything from the zip file, not just the batch file that you have to run, right? If that was the case, I also might mention running the script as admin would be a good idea. If this still doesn't work I have another idea of a reason why, had something similar happen to someone I helped and man was the reason weird.
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OK, shift + right click the folder that everything is extracted to and hit "new command prompt here", or something like that. Downside to what I'm telling Younis I'm not sure if the command promoted will have admin access, but if you know hot to use a command prompt, then feel free to run one as admin and CD into the directory. Anyways type the script name into the command promoted and press enter and try it. I had something like this happen before that didn't make sense but it worked when I did it like this.
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The fastboot and adb commands are in the kffa folder right?
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Maybe its time to give SRT a try.
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