I tried the update for my D55 and it wouldn't work ;-( I dled the the file to the card, then unzipped the file on the same card, then delete the zipped file, I put it in the camera and it didn't do anything, I hit the ok button and it did switch to upgade now but couldn't get it to say yes, will try dling the file to computer and unzipping the file then copying to card, and see if it works