The NTSB said the cargo jet’s wheel brakes were applied, but its speed brakes and thrust reversers did not deploy, according to available data.
https://www.foxnews.com/us/data-shows-amazon-jets-key-braking-systems-did-not-deploy-deadly-miami-crash-ntsb
https://www.foxnews.com/us/data-shows-amazon-jets-key-braking-systems-did-not-deploy-deadly-miami-crash-ntsb