Why has OTA update say my device has been modified and can't get EM?

I have since unrooted my galaxy s4 mini GT-I9197, 4.2.2,JB- in Australia...
after ridding unused stuff, google books an the like.... why cant i get OTA happening, am I able to get 4.3 JB , also did a reset on it and tried again wif the same response back OTA, what versions past 4.2.2 will leave me with an unlocked dock

May andriodcentral be with me

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