Cydia Not Opening on Jailbroken iPhone 4 Running iOS 5 Firmware

Hello Karen! Well, this error is quite unusual. But I am pretty sure that you have probably restored some corrupted data on your jailbroken iOS device. So in order to fix this, you will need to do a clean iOS 5 restore, which means avoid restoring backup on your iPhone once new firmware has been restored on your device. Once completely restored on iOS 5, I would also recommend you to check your iCloud storage on your Windows or Mac before restoring files that you have synced. If you are using Dropbox, I would also recommend you to check all of your synced data on your computer before installing the app on your device.

Now to get an iOS 5 jailbreak, you have to download Redsn0w 0.9.9b7 from here, and then navigate to this link for the step-by-step guide on how to jailbreak using Redsn0w 0.9.9b7. After jailbreaking your iPhone, boot it into tethered mode to fully activate the jailbreak. Once booted, launch Cydia from the Springboard of your jailbroken iOS device and then download a jailbreak app called Crashed Reporter under BigBoss repo. Crashed Reporter will help you to analyze the crash reasons of various jailbreak and iTunes App Store apps. That’s it! Good luck!