Originally Posted by TheDoolster
Very bad tool. It bricked my Kindle.
I'm sorry to here that, the thing is this tool was primarily made to unbrick your device. Also the only thing this tool does is flash a system.img(and erase cache and userdata is you chose to), so if something was messed with outside the system partition it does no good.
I personally used this tool many times and have confirmed others that have used it with no problems. Now if you could be more specific as to exactly what happened and the reason you were using this tool maybe a solution could be found, in the process helping me and others if there is a problem with it. Lets try to figure this out before claiming it is a "bad" tool.
I can see there seems to be a problem with a file missing(from platform tools of sdk) to allow this to downgrade the system. If someone can point this out please let me know. Although I no longer own the 7" model so I cannot test this myself. That said if anyone would like to take over updating this tool for the 7" feel free.