GT-i9515 Bootloader Unlocking and Custom Rom flashing - Galaxy S 4 Q&A, Help & Troubleshooting

Hey guys,
a friend of mine has a Galaxy S4 GT-i9515 and wants to get a Custom Rom. I know how to flash the Rom on it and how to make a backup and and and. But the one thing i donĀ“t know is, how I can unlock the bootloader. It would be really nice if someone can show me a Thread or at least tell me how to do it. I searched for a Thread, but i could not find one for the GT-i9515, just for the other models and i dont want to do something wrong. Thats the reason I ask you
Thank you from now

I don't think there are any I9515 models with locked bootloaders.

Don't run any bootloader unlock apps on the phone as this will probably brick the phone.

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