You should be able to rename the zImage.bin file and reflash. When you flash with a new zImage.bin and/or initrd.img file, it doesn\'t touch the part of the rom that actually performs the flash (unlike flashing with an OSPACK file). Therefore, you should be fine after fixing the filename (I\'ve screwed this type of flash many times, and never had a problem recovering).
Try doing a \"D + P +reset\", you should get a utility menu. Go to the third page (hit right button 2 times), and I think option 7 is to do an update from CF. As long as you get this menu, you should be able to recover.