interesting.

this plant needs some serious help.
Looks to me, your massively over watering & feeding it way way too much nutrients.
No idea what your setup is.

I would scrap it and start over.

If you wanted to save it. you would need to take it out of the flower cycle and re vegetate him for 1-2 months, let it rebuild the damage, trim off all the bad spots. Then clone it once it flourished.

You have some green under there, everything else looks burnt, a tell tell sign for over feeding is the tips will start to discolor, turn orange then brown, then crumble like burnt paper.