So I did a brisket and it didn't come out tender it came out a bit tough and I was wondering if anyone could tell me what I did wrong. It was a four lb flat. I injected it with a beef broth and put on my rub. I let it sit for like three hours in the fridge that way. I then smoked it at 225 till it hit 160. I wrapped it in some stubbs beef and cooked it at 225 till it hit 192 then allowed it to rest for a little over an hour. What did I do wrong or what can I do to help it get even more tender the only thing I can think of is that I didn't let it rest long enough. Any help can be appreciated and much needed