On the 9th of December, Mozilla signed over 1.2 to their hardware partners. The very next day ZTE released version 1.1 for the European/American standard eBay bought Opens. The zip package is applied via SD card and is data destructive effectively resetting phone to a factory state. However as long as you back up your contacts to SD card (using Con Backup from Marketplace) you will be able to import them once your phone is updated.
While still buggy, 1.1 brings a stash of stability, no more freezing for us early adopters! The odd web page rarely crashes & the user agent is still not always recognized, but this is to be expected as early days. All in all, upgrade that sucker!!!