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OK, think I figured out how to code that byte, actually... LOL Can you tell I'm bored this afternoon?

The byte highlighted is the hexadecimal representation of the last level you've completed. So, in my paste, the last level I've completed is 17... in hex, the decimal number 17 is represented as 11.

You can do the conversion by going into your windows calculator, viewing in scientific mode... type the level number in decimal (Dec), then click on Hex to convert it. Replace the value in 000000D4 (as per the screenshot), and viola!

As such, since I believe the last level is level 50, by coding '32' in that byte and saving you will have unlocked all the levels in the game.