No, my N3 comes with XXUBMI6 (4.3) dated 11th Sept 2013 at bootup, but this is my works phone for my business, so I want 442 stock to be ok. I have read that theres an Update called MD6 which fixes the bugs of MD5, as long as i get good battery and for the N3 to function as it should then ill just update, but im asking if anyone has had any real issues with KK 442, like the issues on the S4 KK?

Thanks,

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My recommendation, stay at 4.3 if you don't have any problems. I only update to kk, because Deepsleep problem in 4.3.
After updating to KitKat I don't have the Deepsleep issue.
The SD CARD permission crap for most 3rd party apps is not important for me
If for you, than stay at 4.3

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All i use the SD card for is Photos, which is connected to OneDrive and Music, nothing else.. so like you I didnt have an issue on the SD either, But it sounds like 442 is fine, Ive just been burned by the s4 crap, and am a bit apprehensive..