I've sometimes found upgrades mess up things that were working fine, such as with my android phone. Not sure I should do the upgrade on the Kindle. Thoughts out there?
Kindle Fire updates are usually pretty smooth. I never had acmny issues when I owned one.
Current devices - T-Mobile Galaxy Note 4, Surface Pro 3 Core I5, and Nexus 9
Past Devices - Phones: Nexus 6, Nexus 5, Galaxy Nexus, Nexus S, Galaxy Note 3, Galaxy Note 2, Galaxy S5, Galaxy S4, Galaxy S3, Galaxy S2, HTC Incredible, HTC EVO 4G, HTC EVO, HTC Hero, Motorola Photon.
Tablets: Nexus 7 (2013), Nexus 7 (2012), Lenovo Yoga Tablet 2 Windows 8.1, Dell Venue 8, Galaxy Tab Pro, Galaxy Note 10.1 2014 Edition, Galaxy Note 10.1, Galaxy Note 8, Kindle Fire HD 8.4, Kindle Fire HD 7, Kindle Fire, iPad 2, iPad 1, Nook HD, Nook.