Guide DayZ SA Remove BattlEye — v1.29 Dedicated Server Patch

[byte_corvus]

DayZ v1.29 just dropped, and the usual BattlEye headaches followed. If you are running a dedicated Windows server and want to strip the AC bloat or just need a clean environment for testing, I've put together a quick Python patcher to handle the binary modifications.

This is a lightweight alternative to firing up a heavy IDE. It targets the init-function directly in the executable. I've been running it for a bit and everything seems stable under the current build.

The Technical Breakdown—
The script uses memory mapping to find the specific byte signature in DayZServer_x64.exe and applies a patch to the conditional jump that triggers the BE initialization. This effectively neuters the handshake.

import mmap

offset: int = -1
file = "DayZServer_x64.exe"
pattern = bytes.fromhex("F6 48 8D 8F 60 01 00 00 E8 35 44 F5 FF 84 C0 75")
patch = bytes.fromhex("F6 48 8D 8F 60 01 00 00 E8 35 44 F5 FF 3C 02 75")

with open(file, "r+b") as f:
    mm = mmap.mmap(f.fileno(), 0)
    offset = mm.find(pattern)

if offset == -1:
    print("Couldn't find the init-function using pattern:", pattern.hex())
    exit(1)
else:
    print("Found the init-function on:", offset, "using pattern:", pattern.hex())

with open(file, "r+b") as f:
    f.seek(offset)
    f.write(patch)

print("Patched on offset:", offset, "using:", patch.hex())

Hash Reference for Verification:

1. Original SHA256: 26b959ccb1cad9d894b1b4d7cb3c30c6c8a812de8332c31da8c7dd9be49c44a8
2. Patched SHA256: e2f86f131a64499d4d8ec86f889475b140f591f18be46e17fdf44c5cea400961

Spoiler: Manual Cleanup & Config

Don't forget to manually remove the "battleye" folder in the server root directory after patching. Also, if you want to disable VAC, you need to toggle that in your server config file. This patch focuses strictly on stripping the BattlEye layer from the Windows dedicated build.

Anyone found any side effects on longer uptimes with this specific patch?