To unlock all venues, enter NEWVIEW as a first name in Create Champ mode.
To receive bonus venues, you should win a match at one of the following venues in Career mode - Madison Square Garden and The Staples Center.
To box as Ko Rey Mo, you have to defeat Ko Rey Mo in the light heavy division in Career mode. This will help you to get the desired result!
To become invulnerable, you have to turn your PlayStation 3 off while any fight in Career mode (when you are knocked down). If you resume the game, you will start it without a loss.