Samsung S4 i337 4.4.2 unlock ok step by step

1./ Downgrade to 4.3 : Flash MK2 AP part with pit JFLTE_USA_ATT_16G.pit



2./ Root by Saferoot



3./ Install safetrap recovery



4./ Unlock ( New security ) by Z3x



5./ Install stock 4.4.2 zip file - I use I337UCUFNB1_Rooted_Stock_ROM.zip , then I flash stock kernel I337_NB1_Stock_Kernel.tar.md5



All is fine



That is my solution for i337

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