Well yes, on the N900 format in that meaning equals reflash... Sorry by the way Im answering from my N900 and obviously it took me too long to type in the answer. I didnt notice other people replied in the thread.

So as I suggested, cross wants to erase all the devices content and get back to factory default. The way to do this is a reflash, not of the OS but the data partition. Ill provide you with instructions once I get home. Give me 'bout half an hour...