Assert Code 200 Cydia Impactor
Cydia Impactor has largely been superseded by for sideloading apps. AltServer uses a different method (refreshing via iTunes WiFi sync) which is more stable on modern iOS versions and avoids many of the assertion errors found in Impactor.
: Current versions of Cydia Impactor are generally restricted to users with active, paid Apple Developer memberships. Free accounts often trigger "Xcode 7.3" or assertion errors. assert code 200 cydia impactor