> For the complete documentation index, see [llms.txt](https://docs.signcod.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.signcod.com/sign/english/games/black-ops-7/ka/troubleshooting/issue-01.md).

# Issue 01

Basic checks and connection fixes for KA.

<mark style="color:$primary;">**SIGN · GUIDE**</mark>

Start with the Basic requirements, then work through the checks that match the issue.

<a href="/sign/english/basics/prepare-your-pc/pc-requirements.md" class="button secondary" data-icon="arrow-right">Open Basic PC Requirements</a>

## System checks <a href="#checks" id="checks"></a>

* Restart your PC and try again.
* Install Microsoft Visual C++ from the button below.
* Disable Windows Defender using the tool linked in this guide.
* Remove conflicting antivirus and anticheat software, including FaceIt, Vanguard, and ESEA.
* Disable overclocking, including MSI Afterburner settings; reset BIOS settings if needed.
* Disable Secure Boot and Memory Integrity using their guides.
* Make sure Windows is updated; this guide recommends Windows 11.

<a href="https://aka.ms/vs/17/release/vc_redist.x64.exe" class="button secondary" data-icon="download">Download Visual C++</a>

<a href="https://www.sordum.org/9480/defender-control-v2-1" class="button secondary" data-icon="arrow-up-right-from-square">Open Defender Control page</a>

<a href="/sign/english/basics/prepare-your-pc/secure-boot.md" class="button secondary" data-icon="arrow-right">Secure Boot</a>

<a href="/sign/english/basics/prepare-your-pc/memory-integrity.md" class="button secondary" data-icon="arrow-right">Memory Integrity</a>

## 0xR / 0xD / 0xI or infinite loading <a href="#connection" id="connection"></a>

* Recheck the system steps above.
* Try the loader with and without a VPN.
* If a VPN does not help, close other VPN services and try Cloudflare.
* Try another connection, such as a phone hotspot.

<a href="https://1.1.1.1" class="button secondary" data-icon="globe">Open Cloudflare</a>

## If the issue continues <a href="#next" id="next"></a>

{% hint style="warning" %}
This guide lists reinstalling Windows from a USB drive as a final option. Review your file backup and retention options before proceeding; this page does not provide reinstall steps.
{% endhint %}

## Need a hand? <a href="#support" id="support"></a>

<mark style="color:$secondary;">**SIGN SUPPORT**</mark>

The Sign team is here to help. Open a Discord ticket and include the page name, the step you reached, and a screenshot of the issue so we can help you more clearly.

<a href="https://discord.gg/siin" class="button primary" data-icon="discord">Get help on Discord</a> <a href="https://www.signcod.com/ar" class="button secondary" data-icon="globe">Visit Sign Website</a>


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