1. If your Kindle Fire is connected to your computer, unplug it.
2. The KFU zip contains a folder called Kindle Fire Utility. Unzip the contents of this folder into a new folder, c:\kfu.
3. Run the install_drivers.bat file that's in the c:\kfu folder. Windows will pop up a UAC prompt, and then start the Kindle Fire Driver Installer.
4. As you step through the installer, you'll receive a Windows Security alert warning you that the drivers are not signed. Install the drivers anyway.
5. The installer should complete successfully and show a confirmation dialog with the driver name:
Verify That the Drivers Were Successfully Installed
Before doing anything risky with your Kindle Fire, make sure that your PC fully recognizes it as an Android device:
1. Connect the Kindle Fire to your computer and wait for a few moments while Windows recognizes it (even if you've plugged it in before).
2. Run Device Manager (Click Start, right-click My Computer, and then select Manage > Device Manager).
3. You should see the Kindle Fire registered as an Android Composite ADB Interface, under Android Phone in the Device Manager tree.
If you see this listing, you're good to go. If this isn't exactly what you see, you'll need to do some troubleshooting; for that, refer to the original guide which has an extended troubleshooting section under the heading "What can I do if the drivers won't load?"
Switch to Fastboot Mode
It's still not too late to turn back. Up until this point, you haven't done anything to the Kindle itself. But now you're about to take the first step that involves making changes to the tablet. So, without further ado:
1. Make sure that the Kindle Fire is still connected to your computer.
2. Create a new subfolder, c:\kfu\software.
3. Unzip fbmode.zip into c:\kfu\software. It contains a single file, called fbmode (with no suffix).
4. Open a command prompt window, and copy fbmode into a user-writable location on the Kindle Fire using ADB:
adb push C:\kfu\software\fbmode /data/local/tmp/
5. Edit fbmode's permissions so that it can run:
adb shell chmod 755 /data/local/tmp/fbmode
6. Run fbmode to switch to fastboot mode:
adb shell /data/local/tmp/fbmode
7. Using ADB, reboot the Kindle Fire:
adb reboot
At the end of this process, your command prompt window should look like this:
