Means you have updated it using the wrong firmware.
try download the correct unlocked firmware. you should not need the nck code.
It seems your mobile is just an patch unlock so every time you update your phone it will lock to its original provider, but if the erom and gdfd_sw_bin if flash,it will permanently unlock and you can use any sim provider no matter how many update you make. This method is so technical and it will be fixed by using gsm gadget instead,most mobile service center have this tool. instead of asking for a paid unlock code which is more expensive, unlocking service by going to any the neatest mobile service center is more cheater and it is negotiable instead than online unlocking service.
Good Luck...
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