https://www.macstories.net/iphone/cydia-and-mobilesubstrate-updated-with-ios-4-compatibility/
Cydia and MobileSubstrate Updated with iOS 4 Compatibility - MacStories
Earlier today Saurik pushed an update for both Cydia and MobileSubstrate, which should now be iOS 4-compatible. To install the updates, just fire up Cydia and...
ios 4cydiamobilesubstrateupdatedcompatibility