Fix Ready or Not Checksum Mismatch Error

The **checksum mismatch error** in Ready or Not disrupts multiplayer sessions, often displaying messages like “YOU HAVE BEEN KICKED: PAK CHECKSUM MISMATCH (SERVER REQUIRES YOU TO BE RUNNING THE SAME MODS)”. This issue arises when game files between players or server don’t match, typically due to mods or version discrepancies.

Understanding the Checksum Mismatch Problem

In tactical shooters like Ready or Not, checksums verify file integrity. A mismatch occurs if one player has modified .pak files from mods while others don’t, preventing joins. Common triggers include unsubscribed mods lingering in folders or post-update incompatibilities. All squad members must apply fixes for success.

Quick Fix: Disable Server-Side Checksum

The simplest solution disables the server-side checksum feature, allowing mismatched files to connect.

• Launch Ready or Not and navigate to Options from the main menu.
• Select the Gameplay tab.
• Scroll to Server settings at the bottom.
• Toggle Server-Side Checksum to off.

Ensure every player in the group does this. Matches proceed without file checks, though minor glitches may occur. This avoids deletions and reinstalls.

Manual Config Edit for Persistent Issues

If the menu option vanishes or fails, edit the config file directly.

1. Paste %localappdata%/ReadyOrNot/Saved/Config/WindowsNoEditor into Windows Explorer.
2. Open GameUserSettings.ini in Notepad.
3. Locate bServerSideChecksum=True.
4. Change to bServerSideChecksum=False and save.

Restart the game. This forces the disable, resolving hidden setting problems.

Remove Mods Causing Conflicts

Mods are the primary culprit. Clear them via Steam or manually.

Via Steam Mod Manager

• Right-click Ready or Not in Steam library, select Manage > Browse Local Files.
• Navigate to ReadyOrNot/Content/Paks/mod.io.
• Delete all contents.

Manual .pak Deletion

Default path: C:\Program Files (x86)\Steam\steamapps\common\Ready Or Not\ReadyOrNot\Content\Paks. Remove mod .pak files. A clean slate prevents mismatches.

Verify Game File Integrity

Corrupted base files trigger errors. Use Steam’s tool.

1. Right-click Ready or Not in library.
2. Properties > Installed Files > Verify integrity of game files.
3. Wait for scan and repairs.

This restores originals without mods.

Full Reinstallation Guide

For stubborn cases, especially early access to full release transitions.

• Uninstall via Steam.
• Delete residual folders: steamapps/common/Ready Or Not and %localappdata%/ReadyOrNot.
• Reinstall fresh.

Avoids leftover mod traces.

Additional Troubleshooting Steps

Update the Game

Ensure latest version matches friends. Steam auto-updates, but check manually.

Link Mod Accounts

Open mods menu, verify email, link Epic Games if prompted. Syncs subscriptions.

Server Console Check

For hosts, review console logs for specific mismatched files. Update accordingly.

Prevention Tips for Future Play

• Match mods exactly across group.
• Disable checksum pre-session.
• Backup clean installs.
• Monitor patch notes for mod breaks.

FAQ

What causes checksum mismatch in Ready or Not?

Mismatched .pak files from mods or versions.

Does disabling server-side checksum affect gameplay?

Possible minor bugs, but rarely disruptive.

Why won’t uninstall fix mods?

Residual files persist; manual delete required.

Can I keep some mods?

Yes, if all players have identical ones.

Still error after fixes?

Contact support or check forums.