While I attended the T-Dose event, one guy approached me, who had bought the Flame device. He had some issues with the phone.
First, he tried to update the device to Firefox OS 2.1, but he got stuck in the boot loader. We managed to update the base image to 1.80 and then we updated the phone to Firefox OS 2.1.
Then, we advised him to use English in the setup process, because with the Dutch lanaguage the virtual keyboard doesn't work currently.
Even though his phone's date was only a few days off, this caused somehow the Marketplace app to not load at all. He would only get a blank page, wit a "x" in there. It took us a while to find out that the wrong time and date was the cause of that issue. There is bug 1077628 that seems to handle about this.