A Melbourne private schoolboy who repeatedly broke into Apple’s secure computer systems is facing criminal charges after the technology giant called in the FBI.

The teen, who cannot be named for legal reasons, broke into Apple’s mainframe from his suburban home on multiple occasions over a year because he was such a fan of the company, according to his lawyer.

A customer enters the Apple store. The company was "very sensitive about publicity" surrounding the case, the court heard. Credit:AP

The Children’s Court heard on Thursday that he had downloaded 90gb of secure files and accessed customer accounts.

His offending from the age of 16 saw him develop computerised tunnels and online bypassing systems to hide his identity until a raid on his family home uncovered a litany of hacking files and instructions all saved in a folder titled “hacky hack hack”.