ROOT TWRP on G4 H815 Marsmallow possible???

Hi
I´ve searched a lot but could find a way to install custom ROMs, or more precisely: I can´t root, custom recovery, etc

Does anyone knows how I can be rooted? My G4 is H815 (not european) and it came with Android 6 on it. My main reason is to install custom roms.

Please help

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