Ok, I tried this on my Z1 and it asks you for a password for updating the z1 to the z2. I'm going to have to update the files from the z2 image I have and then try the update.... unless someone out there has a secret code that would work and wants to PM it to me.
The guy who gave it to me said that when you stick it into a Z2 that is not bypassable it will make it bypassable with no code. But I don't have a Z2 to try that with.
More to come...
PS, stop PMing me and begging for a copy of this disk, 25 requests in one day is way too much. If you want it for a Z2 bypass then it will get around soon enough. If you want it to update a Z1, don't bother, it won't help the way it is, without a code.