The boys were arrested over the following two months.
Appearing before Justice Woolford in the High Court in Whangārei today, the youth was supported by his parents, grandparents, and Oranga Tamariki staff.
He was ordered to take part in restorative justice, cultural reports, and psychological reports.
The family of the victim was present in court in large numbers and supported by court victim advisers.
The youth, represented by Ron Mansfield KC, was ordered back into Oranga Tamariki custody and will appear for sentencing on May 23.
His alleged co-offender is scheduled to appear for trial on March 8, also in the High Court.