7:23 AM PT -- 1/17 -- AB just posted an alleged text exchange with his now ex-agent ... with Brown saying "We done bro u know it's over."
Rosenhaus responded by saying he will always try to help the NFL superstar, whether he's his agent or not.
"I will always be here to help you but you have to make changes for me to do so."
Rosenhaus added, "I'm not going to comment on this. I will always speak positively about you ... but I can't help you if you won't listen to my advice"
"I will still help you with the grievances versus the Patriots and Raiders even if I'm not your agent."
AB added a message with the text exchange ... saying "[Rosenhaus] been fraud set me up with alot of bad workers put me in this position."
"They try to tell u they help u when u paying them."
Antonio Brownhas been fired by his powerful NFL agent Drew Rosenhaus -- who says he won't work with the embattled WR again until he gets professional help.
Rosenhaus -- who has worked with Brown for years -- sent a letter to the NFL Players Association saying he wants to work with AB again, but strongly believes Antonio needs counsel first, this according to ESPN's Adam Schefter.
Rosenhaus -- whose client list includes stars like Tyreek Hill and Rob Gronkowski -- had been sticking by AB's side through all the drama with the Steelers, Raiders and Patriots ... but now it's clear he's reached his breaking point.
In fact, Brown recently had a workout with the New Orleans Saints but reportedly blew it -- bringing an entourage and camera crew despite being told NOT to do that.
Now, it seems he's on the outs with the NFL -- especially with the league investigating allegations of sexual assault, threats and more -- and Rosenhaus knows AB needs serious help if he expects to get another shot in the league.
Earlier this week, the Hollywood Police Dept. in Florida announced they were severing ties with the WR after he berated officers and his baby mama on video -- calling Brown a terrible role model.
Meanwhile, AB is working on a second career as a boxer -- he's in talks to fight Logan Paul in April ... but it seems Rosenhaus won't be negotiating the contract.