We saw OS 10.0.10.648 leak for the BlackBerry Z10 (STL100-3) not too long ago, and now the same OS has leaked for the BlackBerry 10 Dev Alpha and STL100-1 models (if you don't know your model number, go to Settings > About). For Dev Alpha users, this update brings along some features and fixes that some Z10 owners have received through carrier updates. Keep in mind that you'll need to install this OS from a Windows PC and use extreme caution as it could screw up your device. That being said - make sure you do a full backup first and don't blame us if you break anything along the way. Hit the link below to download.