M7 unlock

Hi all, I'm giving away my old m7 to a friend and when we put the sim card in, it reports it is network locked. I have purchased a code from unlock river, but it's saying it's wrong. I just wanted to check if anyone has had this problem when unlocking a modded phone? The phone is running viper one 9, s-off, unlocked bootloader etc. It did have super cid but I reverted that back to t mobile UK to see of that made a difference but it didn't. The new sim is gsm like the old one. It could still be the code, but I wonder if the mods aren't helping.

Thanks in advance!

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