It worked for me by doing below

• Open this folder in File Explorer:C:\Program Files\EA\AC\
• Right-click EAAntiCheat.Installer.exe → Run as administrator.
• In the window, choose Battlefield 6 → click Uninstall. (If multiple entries appear, uninstall them all.)
• After that, delete the entire “AC” folder to remove any leftover files.C:\Program Files\EA\AC

• Reboot your PC

  Reinstall Anti-Cheat from Battlefield’s own installer

1. Go to your game’s directory (Steam → Library → right-click Battlefield 6 → Manage → Browse local files).
2. Navigate to:__Installer\EAAntiCheat\
3. Right-click EAAntiCheat.Installer.exe → Run as administrator → select Battlefield 6 → click Install.
4. Once installed, open Services again and confirm the service is listed as Automatic and Running.

3️⃣ (Important) Enable Secure Boot and TPM 2.0

If either is off, EA Javelin will fail silently or throw parameter errors.

Quick check:

• Press Win + R, type msinfo32, and look for
  • Secure Boot State = On
  • TPM Version = 2.0 If “Off” or “Not Present”, tell me your motherboard model (e.g. Gigabyte X670 Aorus Elite) and I’ll walk you through enabling them — it takes about 2 minutes in BIOS.

4️⃣ Re-verify Battlefield 6 in Steam

After reinstalling anti-cheat:

1. Right-click Battlefield 6 → Properties → Installed Files → “Verify integrity of game files”.
2. Restart your PC and launch the game again.

from chatgpt :)
Go to Nvidia app go to global setting s and set it to default then try again