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So you have to copy the contents of the 2D letter array into the 2D matrix array? Why not just use the 2D letter array?
If you have to do a copy, you can use a single loop to copy the row arrays...

The convention is to declare arrays of a type with the square brackets associated with the type rather than the variable:

boolean[][] letter = ...


That doesn't make sense to me - what do you...

The assignment instructions you posted tell you what method to call on the LEDFont class, what argument it takes, and what it returns. That's enough documentation to use it. What's the problem?