Therefore , Installer 3 was n't available for 2.0 and the vast majority of users switched to Cydia .
All of the applications compiled for iPhone OS 1.2 and below were no longer able to run on 2.0 .
Installer 3 was n't available for 2.0 and the vast majority of users switched to Cydia .
All of the applications compiled for iPhone OS 1.2 and below were no longer able to run on 2.0 .