Cydia starts to crash right after you Jailbreak your iPhone. You know it’s not 3rd party corrupted repositories or updates, it’s core Cydia file that is corrupt or missing. I tried installing Cydia again with blackra1n and redsn0w, but it failed every-time. To solve this problem, you will need some folder manager. iFile, or open SSH would do that trick, but since Cydia is crashing after the moment you jailbreak, I am sure you didn’t get chance to install those apps in your iPhone.
1. I downloaded iPhone Folder, You could try similar program or download the one I did.
2. Delete Cydia.app in iPhone/Application/Cydia.app
3. Delete files in iPhone/var/lib/apt/lists except “partial” folder Once you reboot, you will see Cydia is completely gone from your iPhone screen.
4. Install a Fresh Cydia with redsn0w. It should install Cydia, which will not crash anymore. Give it a try.