Here is my weird case. I upgraded to 3.1.2 and jailborken using Blackra1n RC3. I installed Cydia but it crashes and kick me out as soon as I tap on it. I tried to restoring + jailbreaking for 4 times and trying to reinstall Cydia but the same problem still exists. I am tired of restoring and jailbreaking. It's been 2 days that I'm stuck in this damn problem. I wanted to uninstall Cydia but that requires either accessing to Cydia itself or using SSH to remove Cydia manually (which in turn needs installing packages from Cydia which I can't access). I wanted to install Rock and then install Cydia from it but Rock doesn't work either. Please help me.