.obj texture not loading correctly

while I am aware that using .obj models for blocks is not recommended, but I am really don't wanna remake the model.

my model has an issue where the texture doesn't load, and that makes the model all black. i cant find a solution to this (or maybe I missed something)

this is how its supposed to look like

this is how It looked (i managed to fix the offset by offsetting the model in blockbench)

is there a way to fix it? any help is appriciated.