What do you mean? If you bought a gen2 device, why would you want to upgrade to gen2? For the repartitioning of /system and /cache and OEM? Don't even know id it works. Does it?
that's great news for anyone who bought a gen1 device, but for those who bought a gen2 device, this guide is still needed. You cant revert to Gen1 if your device never was Gen1.
I'd modify the first post and link to the simpler and risk free version of wbaw, the windows method claimed some victims.
@dibbles and Mahendra Soni - no idea what's wrong there. I'd try to copy on the card Sebastian's Gen2 clockwork update.zip (see the stickies) and flash it from recovery.