Akele from WSTRN has apologised to “friends, family and supporters” after being sentenced to four and a half years in prison.
Akelle Shemai Charles and his brother Naeem Neil Phillip-Charles were given a total of eight years after being charged with violent disorder.
Police say five men wearing motorcycle helmets kicked down the door of a flat in London in January 2016.
In a letter posted on Instagram he wrote: “I’m sorry I have let you down.”
He added: “I’m sorry for letting past situations draw me out and act in a way I thought I had left behind me.”
“I’m sorry to my family for putting you through this and I’m so sorry to [bandmates] Louis and Haile for messing up the most amazing opportunity.”
During the incident the two occupants of the flat in White City in London, a man in his 40s and a woman in her 60s, were then threatened by the men.
A bicycle was thrown at both victims and the woman was punched in the face, resulting in a broken tooth.
Detectives believe the crime was linked to a suspected street robbery earlier in the day.
But they said both victims were entirely innocent and had no idea about the earlier incident.
Image caption The group won best newcomer at the 2016 Mobo Awards
In his letter, Akelle wrote: “I want to wholeheartedly apologise to my supporters, my family, to WSTRN, my management and my record label.
“You guys are the only reason I’ve been able to change as a person.”
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An investigation was launched by detectives from the Trident and Area Crime Command, and both Akelle and Naeem were subsequently arrested and charged on 18 December 2016.
Police have been unable to trace the other three men involved.