Battlefield™ 6 failed to start. Please repair your game installation

After installing RedSec I have the same issue...
Any solution???

Same error

Alright, looks like I figured out what caused it too 

My friend was having the same problem, managed to solve his issue by disabling services on windows related to RAM RGB, Mouse Software, Keyboard Software, Headphones Software, some of these load drivers that may not be compatible with EA Anti-cheat giving that error. Make sure after you disable those services and disable the startup of those applications you restart the pc before trying again.

I'm done. I'm having this same issue through EA. Currently requesting a refund. 2nd time now.

I re-installed the game and found the root of the problem! I uninstalled it, then refreshed both the EA App and Epic Games Launcher (just in case). After that I noticed that Battlefield 6 had changed to Battlefield: Redsec — I suspect they updated the game product because the mode became free-to-play.

Once I re-downloaded it under that new listing, I was able to launch the game correctly!

hey guys, same issue here, but i solved following this steps:
1. go to the BF instalation folder.
2. execute the EAAntiCheat.GameServiceLauncher.exe like a admin, its be slow to launch but works


here the credits of the solution
BF6 Update 1.1.1.0 Fails to Install on EA app — Prompts Full Reinstallation | EA Forums - 12843555

the same error ,i spent 4 hours to find a way,but it not work

Undefine error 1:86001S

I got it working, you have to change the game's language.
In my case, the language was set to Spanish and I changed it to English UK

Don't modify the EA App language; that won't work.