Best stable smooth daily use with great sony's feature firmware version for Z Ultra

[David-Yaoming]

Hi Sony, could you please advice me what version of firmware for C6833 is the best to get better performance, smooth, no bugs, for daily use, together with great sony's features. I don't care the android version. No matter whatever jellybean or kitkat. Just only the android version which is completely perfect quite stable with better performance. Thank you.

[Uliwooly]

@Thommo

Thanks for the help and welcome back. 

[David-Yaoming]

Hi sorry for the question again. i think 14.4.a.0.118 is the latest of kitkat. But i found 14.4.a.0.133 is available. what abt your experience? thanks.