where i said official 7.1.2 ROM?what you mean official 7.1.2 ROM , from vmos official website ?
if my device is arm v7 , did it work with ROM arm64 ? i think i got black screen because arm and arm64 are different ?
i success run ROM 5.1.2 with arm v7
i have black screen in ROM 7.1.2 with arm64
and my device is Samsung J7 (2016) , android 8.1.0, arm v7
your device is not compatible with ARM64 ROM, ask the dev to release armv7 version so I can make custom pre-rooted ROM armv7 version