Great, and I see someone thanked you for this comment.

I don't suppose you noticed that I used weasel words like "appears" and "Please correct me if I am wrong."?

I suppose those words indicated to you and the person who thanked you that I was absolutely sure that you could flash without the usb port and could come up with exact instructions.

However, if you go to the Wiki and look in the Overclocking sections, you will see an area with the following headings:

"6 Changing the Kernel
6.1 Installing a modified Kernel
6.1.1 Flashing using PC
6.1.2 Flashing from N900 xterminal"

Note 6.1.2 indicates that you can do some flashing from the N900. In fact, I have done it myself. Perhaps that has more limits than I realize, but that is why I made the statement in question.