Very similar to the classic Impactor interface but updated frequently to bypass the common errors that plague older tools.
Ensure you aren't using an ancient build. Visit the official cydiaimpactor.com site to download the latest available version for Windows, Mac, or Linux. Why It Might Still Fail assert code 200 cydia impactor
Problems with your Apple ID or two-factor authentication. How to Fix Assert Code 200 Very similar to the classic Impactor interface but
If the error persists, the community has moved on to more reliable tools that handle modern iOS security much better. assert code 200 cydia impactor
Impactor hasn't been updated to match these new protocols.
The gold standard for sideloading. It uses a companion app on your computer (AltServer) to "refresh" apps over Wi-Fi so they never expire.