.hack//G.U. vol. 1//Rebirth Cheats

On the desktop, hold R1+R2 and push square, triangle, square, triangle. Release the R's, then while holding L1+L2, push right, up, right, up. Release and press R3+L3. If you do this quickly enough, the Vol.2 Preview will become viewable in the media performer.

If you have a .Hack//G.U Vol.2//Reminisce clear file on your save card you can start a new game at a higher level then normal.
It starts you at level 35 with gear to match, unfortunately only Haseo gets this bonus though.

At the title screen, select the Convert menu. Selecting save data from .hack//Infection, Mutation or Outbreak will give you an email from BlackRose that was sent to Kite after Quarantine. Selecting .hack//Quarantine save data will give you the previous email, and an email from Hokuto(.hack//AI Buster) sent to Rena(.hack//Legend of the Twilight Bracelet). However, in the Japanese release the Hokuto/Rena email is gained from .hack//Fragment save data.