Firmware upgrade fail (P6000LH)

[OmegaLeWolf]

I've been following the guide and I've finally reached the final firmware upgrade part. I compiled the firmware using the Makefile and altered the update.sh to fit my model as well as alter the private key file to fit my private key and model name. The firmware complies okay but when I try to upgrade, be it using curl or via serial it fails. Curl outputs upgrade=fail and fw_upgrade forceUpdate /tmp/tw.tar outputs either 1 or 0 with no sign of success.
Any suggestions?

[OmegaLeWolf]

Another thing I think is worth asking while I'm here. To access the kernel via serial I always have to interrupt the boot with the alpha168 pw. Is there any way of stopping this? None of the password changing commands have seemed to work when it comes to the localhost login. (I'm able to access HTTP via the login, though.)