Note 4 stuck on AT&T firmware...

Hi All,
I am a newbie when it comes to ROMS but I have rooted all my Android phones, before this one!
I am stuck on this one, my daughter bought it for me from Asia.
At first I thought it was a SM-N910F because that's what it had in the ABOUT screen. Later I discovered it's really an SM-N910A.
No wonder Odin was failing every time I tried to flash an SM-N910F ROM on it.
I managed to upgrade it to 5.0.1 and even 5.1.1 but all stock AT&T roms.
I want to install some other ROM and root this guy.
Can anyone tell me if it's even possible?
I read that these people lock the bootloader and thus it is useless to try to root!

Any help is appriciated.
Thanks

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