How can one reinitialize the HW.1? I've got a HW.1 a while back at a conference without any additional information. I had played around with it a little bit then, but didn't intend to use it as a wallet immediately.

Now, I've been trying to set it up as a wallet. When I start the Ledger Wallet Chrome Plugin, it tells me that I should do a Chip-Firmware-Update.

Unfortunately, it will not let me progress with the Update unless I put in the "Security Card QR-Code". I don't have it, as I just got the plain card, and didn't make note of anything when I was playing around with the HW.1 at first.

So, the Chrome plugin won't let me do anything except go to "update", but won't let me do the update without the Security Code.  

How can I reset or reinitialize the HW.1?

Update:
I've found the page on Ledger's site to generate a new Security Card. By entering the code, I got to a new page requsting that I check a sample from the Security Card. Unfortunately, clicking "Continue" on that page doesn't seem to have any effect. So, I'm still stuck.

I've already written the usb-rules to my system.
I have a HW.1 too. I purchased mine, so it came with the recovery card. If you have your recovery card, you might be able to contact their support and ask how you could convert your security card's details into the 16 byte key

If you can't do this, then use the link you posted previously to generate a random key, and then generate your card. Remember to save both.

Delete the seed currently on the HW.1 by typing in the seed 3 times incorrectly.

Plug your ledger in and then try to update the firmware. Once it prompts you, put in your random key. If this doesn't work, try using their online site. It may not be as safe. IIRC you can download their special initializing software and mount it as a boot drive on a USB and do it air-gapped.

If it still doesn't work, I guess your best bet would be to contact their support.