CITMTA & CIT FixCIT Tools

MTA:SA anti-cheat code

MTA:SA anti-cheat code SD#20

The server does not allow an altered gta3.img or gta_int.img.

Code
SD#20
Where you see it
A kick or restriction message
MTA's own wording
Altered gta3.img/gta_int.img
Family
SD codes

What it means

Those archives hold the game's models. Replacing models inside them changes files the server checks.

SD codes are special detections a server can switch on. Most of them are about the environment MTA is running in: a virtual machine, a blocked component, or a program that can change how the game runs. MTA's own documentation gives this code as Altered gta3.img/gta_int.img.

How to fix it

Work down the list and stop when it is solved.

  1. Use a clean GTA: San Andreas

    MTA needs an unmodified GTA installation. If mods, an ASI loader or a replaced gta_sa.exe are in the game folder, reinstall GTA into a fresh folder and let MTA use that copy.

  2. Reinstall GTA into a fresh folder

    Put the modded copy aside and let MTA use a clean installation. Servers deliver their own models while you play.

  3. Read the whole message, then the official page

    The number names a detection category, not a program on your computer. MTA's anti-cheat guide lists what each category covers, and the full message is what tells you which case you are in.

Read this first

MTA's anti-cheat guide publishes the category, not the detector. The guide itself says the list is incomplete and that a detection does not prove intent. Keep the whole message: the part after the code is what tells you which case you are in.

Still stuck? The Fix tool reads MTA's own log on your computer and points at the matching steps. Nothing is uploaded.

Open the Fix tool

Other SD codes

Every MTA:SA error code · Crash codes and offsets

Where this comes from

Public category; a restriction or input policy does not itself establish a ban.

Meanings read from these sources on 5 September 2026 and written in our own words here.