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OK, I think it looks bad here. But first go and try what geekmaster suggested, i.e. trying out a few variations of the password.
If that doesn't work, I don't see a lot of options - especially none that have been tried out before. In fact, I'm learning for the first time (well, or my memory isn't too well, also possible) that the uboot menu is accessible.
uboot doesn't seem to be able to write to flash memory (and I'm somewhat puzzled that I don't see indications for reading flash memory either). So using the serial console, the option is probably to load (loadb/loady) a kernel with included initramfs (containing enough software to provide a basic rescue system) via the serial line and start it. Note that you would need to hand-tailor such a kernel (plus initramfs payload) yourself.
Another option is the Advanced Toolkit and the USB loader mode -- however, this way hasn't been gone before, either. And it's not quite clear what this mode is able to do, but in theory it could provide a backup/restore path like the one for the K4/K5.
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