The prisoner, Aniseko Vaelei, was handcuffed when he appeared before the chief justice on Monday.
He admitted to eight charges including one of escape from prison.
But he denied eight other charges which relate to the aggravated robbery of a supermarket at Vailoa Faleata village in which a Chinese woman was allegedly assaulted.
Aniseko, who was captured at Tapatapao in early March, will stand trial in September on the latest charges.
