Created by Riley Testut, AltStore is the modern replacement for Cydia Impactor. It solves the code 200 error by using a desktop companion (AltServer) that leverages iTunes WiFi sync protocols and a personal developer certificate that renews itself automatically every 7 days.
Old or conflicting development certificates on your device can cause installation failures. Open Cydia Impactor. Navigate to the menu. Select Revoke Certificates . assert code 200 cydia impactor