If you have a Flame reference device and wanna try out alternate versions of Firefox OS apart from the stock one, but not willing to build from source, then follow this mini-manual.
You can download the packages from the Nightly Build directories of Mozilla FTP. You specifically need the following two files:
- b2g-XX.0a1.en-US.android-arm.tar.gz (XX is the version number)
- gaia.zip