Mirai - Finding the root hash

So far, I’ve managed to recover root.txt, or at least I think, but it is 0 bytes? Can anyone give any tips? Thanks. Sorry if I’m not following etiquette, I’m new to this.

mirai got retired today. Watch ippsec video about it: HackTheBox - Mirai - YouTube

I wrote a guide if you want to check out. I would love to hear any feedback.