Spontanous restart and Kindle is upgrading loop
The process went painlessly for me, making the modifications into a Safestrap partition.
I was able to install a number of apps from the google play store but, after a while, the device dropped into a continuous loop of the yellow Kindle Fire screen, followed by a Kindle is upgrading message.
After several loops, the device finally shows the home screen.
Is this a common experience? Is there a fix?