CDJ900ModsWeb/builder.html

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  <title>Pionaarr Mods Builder</title>
  <meta name="description" content="Build your own modded C900NXS.UPD in the browser: upload the official 1.31 update, tick the mods, download the file. Nothing leaves your computer.">
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    <a class="brand" href="index.html"><span class="cue-key" aria-hidden="true">CUE</span><span>Pionaarr Mods</span></a>
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  <div class="warnbar" role="note"><strong>For the living room, not the booth.</strong> These mods are made for home use and for trying things out. They are not proven for clubs, gigs or any other professional use: a player can behave unexpectedly or stop. At a gig, play the official firmware.</div>
  <div class="eyebrow">Builder</div>
  <h1>Build your update</h1>
  <p class="lead">Choose the official CDJ-900NXS <strong>1.31</strong> update, tick the mods, download your <code>C900NXS.UPD</code>. It all runs in your browser.</p>

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  <section class="step" id="step-file">
    <div class="step-n">1</div>
    <div class="step-body">
      <h2>The official update</h2>
      <p>Pioneer DJ's <code>C900NXS.UPD</code> for firmware 1.31. The builder checks its SHA-256 and refuses any other file.</p>
      <label class="drop" id="drop">
        <input type="file" id="file" accept=".UPD,.upd">
        <span class="drop-t"><strong>Choose C900NXS.UPD</strong> or drop it here</span>
        <span class="drop-s" id="file-state">No file yet</span>
      </label>
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  </section>

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  <section class="step" id="step-mods">
    <div class="step-n">2</div>
    <div class="step-body">
      <h2>The mods</h2>
      <p>Ticking a mod also ticks what it needs; unticking one unticks what needs it.</p>
      <div class="picks-bar">
        <button class="stock-btn" type="button" id="stock" aria-pressed="false"><span class="sw" aria-hidden="true"></span>Stock firmware</button>
        <span class="hint">On: no mods, the official 1.31 relabelled so the player takes it — the way back.</span>
      </div>
      <div class="picks" id="picks"></div>
      <p class="hint" id="pick-note"></p>
    </div>
  </section>

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  <section class="step" id="step-ok">
    <div class="step-n">3</div>
    <div class="step-body">
      <h2>Before you build</h2>
      <div class="callout warn">
        <strong>Unofficial firmware.</strong> Flashing modified firmware can leave your player unusable. The boot loader and the recovery stay untouched, so an official update can still be run, but there is no guarantee.
      </div>
      <label class="agree"><input type="checkbox" id="agree-risk"> I flash this at my own risk. The authors accept <strong>no liability</strong> for any damage to my player, my data or anything else.</label>
      <label class="agree"><input type="checkbox" id="agree-ai"> I understand that our mods, this builder and the website were written with <strong>Claude Code</strong> (Anthropic's AI coding assistant, Claude Opus 5.5) and tested in an emulator and on one player.</label>
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  </section>

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  <section class="step" id="step-build">
    <div class="step-n">4</div>
    <div class="step-body">
      <h2>Build</h2>
      <button class="btn primary" type="button" id="build" disabled>Build C900NXS.UPD</button>
      <span class="hint" id="build-why"></span>
      <div class="log" id="log" hidden></div>
      <div class="result" id="result" hidden>
        <a class="btn primary" id="download" download="C900NXS.UPD">Download C900NXS.UPD</a>
        <div class="sum" id="sum"></div>
        <details>
          <summary>What was checked</summary>
          <ul id="checks"></ul>
        </details>
        <p class="hint">Copy <code>C900NXS.UPD</code> to the root of a FAT32 USB stick and run the update on the player as for an official one. The file is labelled 1.32 so the player installs it; the player still reports 1.31.</p>
      </div>
    </div>
  </section>
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    <div>
      <div class="ai"><span class="dot"></span>Made with Claude Code · Claude Opus 5.5</div>
      <p>This website, the builder, our mods and the patcher were developed with Claude Code (Anthropic's AI coding assistant, model Claude Opus 5.5), by reverse engineering the firmware in an emulator. The mods <code>extended_bpm</code> and <code>phasemeter</code> are by <a href="https://github.com/arnoldasr/cdj900nxs">arnoldasr</a>.</p>
    </div>
    <div>
      <h4>Disclaimer</h4>
      <p>Unofficial. Not affiliated with or endorsed by Pioneer DJ or AlphaTheta; CDJ and rekordbox are their trademarks. Flashing modified firmware can leave your player unusable. Everything here is provided as is, without warranty, and used at your own risk.</p>
      <p class="legal"><a href="impressum.html">Impressum</a> · <a href="datenschutz.html">Datenschutz</a></p>
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