The title says it all, really. I just updated an app in Cydia without paying close attention and Cydia uninstalled the Corona 5.0.1 untether! Now my phone boots to the lock screen and resprings. Any ideas? Update 1: Even though springboard keeps crashing, I have continuous access to the file system over USB (thanks to afc2!). Hopefully there's some way to install over USB. Update 2: iH8sn0w himself has offered to help me. Just waiting for him to have free minute. Update 3: the reason Cydia uninstalled the Corona Untether was that I had edited SystemVersion.plist so I could install some software that had been build with unnecessary 5.1 requirement. DON'T DO THAT. Cydia will randomly decide that Corona is incompatible with your OS version and uninstall it.