[Kindle Fire Q&A, Help & Troubleshooting] ivanovicch:
Hi All.

I’ve rooted my Kindle device successfully before (during v6.2 – have the driver installed from this and cable worked successfully )

Now with the 6.3.1, I used the KFU v0.9.6 to do it – option 2 ‘Install Permanent Root with Superuser’

Followed the instructions as per http://xdaforums.com/showthread.php?t=1399889

- On my XP machine, it detected my Kindle initially but it stopped and my Kindle Fire was showing the stock welcome screen but kept on rebooting.

- Then I tried on a Win 7 machine and ran option 2 again – it did something and now my Kindle is stuck on the FFF screen (Kindle Fire logo in blue and white – v1.4a).

- Now when I run ‘ran.bat’, pc it shows ‘waiting for device’

- The FFF screen was blinking initially but now it’s permanently on.

- I can off my Kindle by pressing the on button for about 20 seconds and when I connect my Kindle in the off state to the pc, it turns on and remain on the FFF screen

1. Installing the driver

So I figured the above is due to the driver.

- However, the Kindle is not appearing in the Device Manager with a yellow ! – hence can’t manually install the drivers.

- Tried install_drivers.bat – it says ‘Google, Inc. (WinUSB)…..Install failed (Unsigned)’

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- I ensured that the ‘Driver Signing Options’ is set to ‘Ignore – Install the software and don’t ask for my approval’ and ‘Make this action the system default’.

- So next, I tried to force my XP to install the drivers (Kindle unplugged), by using ‘Add Hardware’ and installing drivers from c:\kfu\drivers –

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- Installed all 3 drivers – Android ADB Interface, Android Bootloader Interface & Android Composite ADB Interface.

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- Received this message at the end – ‘The software for this device is now installed, but may not work correctly. The device cannot start. (Code 10)’

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- But when I plugged in my Kindle and run KFU it still says ‘waiting for device’.

I tried the above steps with:-

- 3 XP machines and 1 Win 7, and

- on different USB ports (tried both USB 2.0 and 3.0)

- and tried using 4 different usb cables

- Same results ‘waiting for device’

- One exception though – for the Win 7 machine – when I ‘install_drivers.bat’, it says ‘Google, Inc. (WinUSB) ….Ready to use’ – but still shows ‘waiting for device’, when running KFU.

2. Delete old drivers

Followed this (http://xdaforums.com/showthread.php?t=1459116) to uninstall the drivers (including the Microsoft support page).

- But XP and Win 7 still did not detect the Kindle in ‘Device Manager’

- Tried to force install the 3 drivers again and still ‘waiting for device’

Additionally tried to download the Google Usb driver from Android SDK - same issue - no yellow !

And tried to connect via 'c:\KindleAdb\adb devices' (learned from the previous root exercise) - no devices appears.

3. Kindle Fire Unbrick Utility

Tried this next - http://xdaforums.com/showthread.php?t=1428428

Tried the many options available. When it is executed, its says ‘error’, despite saying Kindle unbricked at the end.

4. Firekit LiveUSB repair kit 1.1

Finally decided to use the Linux method (http://xdaforums.com/showthread.php?t=1430038)

- Created a USB Ubuntu and ran the program but suprisingly still the same problem – stuck at ‘waiting for device’ (see snapshot attached).

So I’m a bit confused right now. From the above it seems to me that the Kindle is not talking to the PC.

- But if in Linux, it doesn’t work (which from what I read doesn’t require a driver?) then it could possibly be my cable.

- But the cable did work when I rooted in 6.2 and it also worked initially when I used KFU. And also, I tried with 4 different cables.

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- Am not sure if the cables are ‘factory cable’ – but it did work initially.

I’m stuck here. Any help/advice would be deeply appreciated. Thank you.