Fire Stick, 1st generation, Build 5.2.10

Hi – finding conflicting info on updating from Jarvis to Krypton on a Fire Stick (mine is 1st generation):

1) Does upgrade from Jarvis to Krypton typically work on this device? (Currently dealing with buffering issues on current Fire Stick/Jarvis set-up )
2) Is Krypton build worth the time it will take a novice to upgrade?
3) Should i turn off auto updates on my fire stick? I’ve seen several recent threads with update issues…

ty, g[/size]