The reality TV star was contracted to the British brand for the start of his combat career but was released on a one-fight deal to compete with Bellator in May.
The 31-year-old impressed the Wembley Arena crowd with a first-round win and he was expected to kick-on and add to his 4-0 record.
But he has spent the last four months sidelined after clashing with BAMMA but has now resolved the issue.
On Twitter, Chalmers wrote: “Thanks to @BAMMA for resolving the court issue in an amicable manner, and for allowing me to leave my BAMMA contract early.
“I am now looking forward to the next stage in my career and continuing where I left off".
Chalmers explained in August that he was losing earnings in and outside the cage due to the dispute.
He said: “I never signed with Bellator. BAMMA gave me a one-fight release, so I could fight on Bellator and afterwards they said they would release us which was part of the deal and it never got stuck to. It's unfortunate that it's had to go to court.
“Apparently there were some things that were said, apparently I wasn't making a difference when it come to the fighting, ticket sales.
"But my last fight in my hometown was 6,500 people, their last show was 300 people so there's a bit of a difference there.”
He added: “It's not just affecting my fighting, it's affecting other things. I've had TV offers that I can't sign for because it's in court.
“I've got offers from a big boxing promotion that I can't look at.
“Obviously, I've got an offer on the table from Bellator that I can't sign. It's just holding everything back. "It's unfortunate that it's come to this because when I was with BAMMA we had a great relationship.”
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