Ran this through ChatGPT about our version of OS and this was it's reply.
"Your Windows 11 Pro, Version 25H2 (OS Build 26200.6584) is not a normal/stable release — it’s an Insider Preview build.
Here’s what that means:
25H2 → This is Microsoft’s codename for the next big Windows 11 feature update, scheduled for late 2025.
Build 26200.xxx → This is part of the Insider Canary/Dev channel (pre-release testing builds). These builds often introduce new APIs, kernel changes, and security enforcement tweaks that can break compatibility with apps and anticheat systems.
Stable (normal) builds today → The official, widely supported version as of now is Windows 11 23H2 (Build 22631.x). That’s what most software (including EA Javelin AntiCheat) is tested and supported on.
⚠️ Why this matters
EA Javelin (Battlefield 6’s anticheat) likely hasn’t been updated/tested against 25H2 Insider builds yet.
That’s why the service crashes with Error 87 (parameter incorrect) — the anticheat’s startup checks for Secure Boot/TPM are failing on this new build.
Other anticheats (like BattlEye, EAC, Vanguard) already adapted, but Javelin hasn’t caught up yet.
👉 So no, you’re not on a “normal” retail build. You’re on a future Insider build.
If you want to guarantee compatibility, you’d need to roll back to 23H2 stable (22631.x) until EA/DICE update Javelin to support 25H2."
And that must confirm odd12l4jf8bb's fix comment above mine. Unfortunately I already refunded so I will be unable to attempt.
I installed a clean Windows 11 24H2 (Build 26100.1742) on my second SSD — the game now runs perfectly fine, no issues at all.
It clearly confirms that EA Javelin Anticheat doesn’t work properly on Windows 11 25H2 (Build 26200), but works fine on 24H2.
I was just lucky that about a month ago I created a bootable USB with this 24H2 build.
So for now, I’ll keep playing on this version and wait for an official EA patch or compatibility update for 25H2.
