This rarely works for assert code 200 because the error occurs before team ID negotiation.
: This error often occurs if you are using your standard Apple ID password with Two-Factor Authentication (2FA) enabled. Log in to appleid.apple.com and generate an app-specific password to use in Cydia Impactor instead.
“Still?” she asked.
In the context of Cydia Impactor, "assert code 200" is almost exclusively related to issues regarding your Apple ID password.
: Temporary issues with Apple's certificate signing servers. Recommended Fixes assert code 200 cydia impactor
Select your Apple ID under the "Developer App" section and tap Apple Support as a replacement? Untrusted Enterprise Apps (Developer) in iOS - Applivery
“Progress: 90%... file: kernelcache.release.iphone10... assert code 200: signature verification failed.” This rarely works for assert code 200 because
: A popular on-device alternative that allows you to sideload and refresh apps wirelessly over your local Wi-Fi network.
The "assert code 200" error occurs during this handshake phase. It is not an error with the IPA file itself, nor is it usually an error with your computer. It is an authentication failure. “Still
“assert code 200: signature valid. Proceeding.”