Or if your first digits of the serial number don't match BUT you have a device of the same model, AND you have jailbroken and installed KUAL, download main-htmlviewer.tar.gz and extensions.zip from this link.
http://kdroid.org/firmtest/droid/dro...%E6%9C%BA.html
open extensions.zip and put its content into the extensions folder of your jailbroken kindle. then put main-htmlviewer.tar.gz directly iinto into your kindle(not in he extensions folder or any other folder). DO NOT UNZIP THE TAR.GZ FILE!! Once you restarted, you should see the bootandroid option in your kindle. click it.
Do not touch the power button or else the kindle might break!!
now go to this link
http://kdroid.org/firmtest/droid/droid.190415/
and download the corect firmware.
unzip its contents to somewhere you prefer.
go to the unzipped folder and find the drivers. for windows 32-bit, please install x86.exe.
For windows 64 bit please install x64.exe.
Then install adb-setup-1.4.2.exe. you may have to right-lick and run as administrator.
now run fastdownload.exe as admin and connect your kindle which should have a white screen. If you are a nerd and prefer to save the money and install your own android, good. Because your kindle now is in fastboot mode, install your own android system.
If you prefer the android system that has been modified to fit the kindle, then type 5 in the fastdownload.exe for dual-boot so you can go back to the original kindle or press 1-4 to boot it only into android.
BE CAREFUL AS SONE OPTIONS MIGHT WIPE YOUR ENTIRE DISK. IT SUOULD SAY WHAT OPTIONS DO WHAT. IF YOU DO NOT SEE CHINESE CHARACTERS BUT SEE WEIRD STUFF THEN READ THE ENGLISH AFTER IT.
When you finally choose the option press enter to begin the process.
Do not disconnect your kindle!!
Now you should be able to see an android screen that says upgrading android. follow the on-screen instructions to continue. You might need to connect to wi-fi to buy and activate android.