There is no single official tool, but several community-created applications have circulated on forums like Nexus Mods, Reddit, and various cheating forums.
Using save editors always carries a tiny risk of corruption. Here is the golden rule: Always backup your save file.
Step-by-step:
For Madden players, the CMS 2021 Save Editor (often named "Madden Franchise Editor") requires a different approach due to EA's encryption.
The CMS 2021 editor includes a specific script for the Madden 21 "Week 17 Super Sim Crash." Run the "Sanitize Schedule" tool to reset the playoff seeding logic.
Unlike basic in-game menus, the CMS editor is a standalone application that reads your franchise save files (.franchise). It allows you to manipulate the database behind your league. Think of it as a SQL editor with a user-friendly skin specifically built for Madden 21.