htc one m7 boot loop wont recover

[AC Question]

I was given and old HTC one m7 from my friend he said it was bricked. Its not bricked but it is stuck in a boot loop and recovery does nothing. I'm not sure what he did to it or why it wont boot. I'm assuming the OS got deleted so I am asking this. how to I get any version of android on this thing? preferably what it came with? its a cool phone and I think it works, it just doesn't have anything to work with.