Question Sim unlock

Hi guys can anyone help unlock my globe philippines locked note 2 running on 4.4 kitkat
the unlock code thing only works for 4.1.1

question
1) do i need to download the whole rom and downgrade to 4.1.1
2) if successful if i update to 4.4 again will it be simlocked again
3) is there an easy way around? i read somewhere to download only the modem but im not familiar with that

help me please thanks alot guys