However, Tsarnaev'a fate has long remained in limbo, though he was sentenced to die back in 2015 for his role in the fatal April 2013 bombing.
Tsarnaev and his late older brother, Tamerlan Tsarnaev, set off bombs during the 2013 Boston Marathon, killing three people and injuring hundreds.
An email seeking comment was sent to an attorney for Tsarnaev.
The trial judge allowed his jury to include jurors who had "already formed an opinion that Dzhokhar was guilty - and he did so in large part because they answered "yes" to the question whether they could decide this high-profile case based on the evidence".More news: Brendan Gleeson Plays Donald Trump In New Series — TRAILER
Yet the judges emphasized that although they had vacated the death penalty and reversed Dzhokhar's convictions on several charges that had errors, the 27-year-old "will spend his remaining days locked up in prison". They also pointed to social media posts from two jurors suggesting they harbored strong opinions even before the 2015 trial started.
A spokesperson for the U.S. Attorney's office in Bostonsaid they are now reviewing the opinion and declined further comment at this time.
The three-judge panel of the 1st US Circuit Court of Appeals in Boston issued the decision on Friday more than six months after arguments were heard in the case.
Dzhokhar's lawyers conceded that their client had committed the acts during the trial, but defended his actions by saying that his participation in the crimes was a result of his brother Tamerlan's influence.
Tsarnaev is now incarcerated at a federal supermax prison in Florence, Colorado. The next planned bombing was to be in Times Square in New York City.More news: Naya Rivera's final TV appearance to be on Netflix's Sugar Rush
Other rulings that overturned some lesser convictions were legal in nature, and would not have affected the outcome of Tsarnaev's sentence.
During the appeal hearing in December, the judges focused much of their questioning on juror bias, asking the lawyers why the two jurors had not been dismissed, or at least why the trial judge had not asked them follow-up questions after the posts came to light on the eve of the trial.
"By not having the jurors identify what it was they already thought they knew about the case, the judge made it too hard for himself and the parties to determine both the nature of any taint (e.g., whether the juror knew something prejudicial not to be conceded at trial) and the possible remedies for the taint", the judges wrote.
"I am sorry for the lives I have taken, for the suffering that I have caused you, for the damage I have done, irreparable damage", said Tsarnaev.More news: 'The Michelle Obama Podcast' Debuts With A Very Special Guest, Barack Obama