Yes, use the Mac flasher from (I assume this is an PPC Mac - if not, then install Linux or something on a spare partition): http://tablets-dev.nokia.com/d3.php

And invoke the flasher with "flasher-2.0.macosx --disable-rd-mode". And once that is done, you will want to update. Instructions can be found here: http://wiki.maemo.org/Updating_the_tablet_firmware

Sorry, didn't read the part where you said you have already flashed it to Diablo. If you don't want to reflash, disabling RD-Mode will remove the green information upon bootup. Good luck!

The syntax for the Mac flasher is the same as the Linux one.