I've successfully rooted my KFHD usind SRSRoot for Android, but my laptop does not recognise the device in My Computer - using windows xp I go to to Device Manager and Kindle is there, along with sub-folder - Android ADB interface and Android Composite ADB interface, the properties say both devices are working, although the drivers are not digitally signed. The KFHD opens and I can get on the internet ok, but can't transfer anything or programme any further for google play store etc. Any advice appreciated 
