I have created a package called "notmynokia" which is in extras-devel. If you install this, it tries to protect you from the forced MyNokia registration. You should install the package before upgrading to PR1.2. It seems to work for OTA upgrades. I have not yet tested it for re-flash but I believe it may work, as long as the eMMC is not re-flashed (unless the process removes the /home/user/.cherry_state file). Test reports are welcome! I have attached the README file if anyone wants more information about what it is doing. Graham