If you are a Kindle Fire user running software version 6.3 and wish to retain root while updating your tablet to version 6.3.1, then we have just what you need. The update 6.3.1 has brought number of handy features such as parental controls and numerous security enhancements. However, the dilemma with Kindle Fire has been that updating the tablet results in losing the root access, which is the reason we previously brought you rooting procedures for software version 6.2, 6.2.1, 6.2.2, 6.3, as well as a comprehensive guide to root Kindle Fire.
This time around the process is even easier, in fact you have two options by which you can root your tablet and get it updated. The first method entails downloading and installing the updates and then following this guide to root your Kindle Fire tablet or by installing a custom update.
XDA member nfinite45 has provided a ZIP file that contains files from Kindle Fire software update 6.3.1. In other words, you can simply flash the update via TWRP or ClockworkMod in order to upgrade your tablet from software version 6.3 to 6.3.1, without even loosing root access. This pre-rooted software comes with busybox and su. Furthermore, this update does not wipe any data on your Kindle tablet, but the developer has suggested that you wipe out your dalvik cache and cache partitions, once the update has been installed. You can check out the complete procedure at the XDA Developer’s Forum Thread.