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Hello, I have two iphones. First is iPhone 6 128gb (iCloud lock) and the second is iPhone 6 plus 16gb. I would like to upgrade iPhone 6 plus 16gb. Can I use use and programming 128gb nand memory from iCloud locked iPhone 6? Thank you for answer

You would need a NAND programmer, these are easily 300 dollars and are hard to use unless you know chinese. But you can send it away to someone or find one from china and see if they can program it for you. Or just sell the icloud locked one for parts and buy a new nand chip.