diff --git a/ota/h5/index-beta.html b/ota/h5/index-beta.html
new file mode 100644
index 0000000..91fa73d
--- /dev/null
+++ b/ota/h5/index-beta.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><meta charset="utf-8"><meta http-equiv="refresh" content="0;url=index-stable.html"></head><body></body></html>
\ No newline at end of file
diff --git a/ota/h5/index-nightly.html b/ota/h5/index-nightly.html
new file mode 100644
index 0000000..91fa73d
--- /dev/null
+++ b/ota/h5/index-nightly.html
@@ -0,0 +1 @@
+<!DOCTYPE html><html><head><meta charset="utf-8"><meta http-equiv="refresh" content="0;url=index-stable.html"></head><body></body></html>
\ No newline at end of file
diff --git a/ota/h5/index-stable.html b/ota/h5/index-stable.html
new file mode 100644
index 0000000..1e781fb
--- /dev/null
+++ b/ota/h5/index-stable.html
@@ -0,0 +1,76 @@
+<!DOCTYPE html>
+<html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width">
+<style>
+*{box-sizing:border-box;margin:0;padding:0}
+body{font-family:system-ui;background:#0f172a;color:#e2e8f0;padding:16px}
+h1{font-size:18px;color:#38bdf8}
+.card{background:#1e293b;border-radius:8px;padding:16px;margin:12px 0}
+.card-title{font-size:14px;color:#94a3b8;margin-bottom:8px}
+.btn{display:block;width:100%;padding:14px;margin:8px 0;border:none;border-radius:8px;font-size:16px;cursor:pointer}
+.btn-check{background:#1e40af;color:#fff}
+.btn-download{background:#15803d;color:#fff;display:none}
+.btn-download.show{display:block}
+.log{background:#0f172a;padding:12px;border-radius:8px;margin-top:12px;max-height:200px;overflow-y:auto;font-size:11px;white-space:pre-wrap;color:#94a3b8}
+.ver{color:#94a3b8;font-size:12px;margin:4px 0}
+.gear{position:absolute;top:20px;right:16px;font-size:20px;cursor:pointer;color:#94a3b8}
+.modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.7);z-index:99}
+.modal.show{display:flex;align-items:center;justify-content:center}
+.modal-box{background:#1e293b;border-radius:12px;padding:24px;width:80%;max-width:360px}
+.modal-title{font-size:16px;color:#38bdf8;margin-bottom:16px}
+.ch-opt{display:block;width:100%;padding:12px;margin:6px 0;border:1px solid #334155;border-radius:6px;background:transparent;color:#e2e8f0;font-size:14px;cursor:pointer;text-align:left}
+.ch-opt.on{border-color:#38bdf8;background:#1e40af40}
+.badge{display:inline-block;padding:2px 8px;border-radius:4px;font-size:10px;margin-left:8px}
+.badge-new{background:#dc2626;color:#fff}
+</style></head><body>
+<div class="gear" onclick="openSettings()">⚙️</div>
+<h1>Yuzu GCA</h1>
+<div class="ver"><span id="ver"></span><span id="badge" class="badge badge-new" style="display:none">NEW</span></div>
+<div class="card"><div class="card-title">当前渠道: <span id="chLabel">Stable</span></div></div>
+<button class="btn btn-check" onclick="checkUpdate()">检查更新</button>
+<button class="btn btn-download" id="btnApply" onclick="applyUpdate()">下载更新</button>
+<div class="log" id="log"></div>
+
+<div class="modal" id="modal">
+ <div class="modal-box">
+  <div class="modal-title">选择渠道</div>
+  <button class="ch-opt on" onclick="setChannel('stable')">Stable (发行)</button>
+  <button class="ch-opt" onclick="setChannel('beta')">Beta (测试)</button>
+  <button class="ch-opt" onclick="setChannel('nightly')">Nightly (开发)</button>
+  <button class="btn btn-check" style="margin-top:12px" onclick="closeSettings()">关闭</button>
+ </div>
+</div>
+<script>
+var channel=localStorage.getItem('gca_channel')||'stable';
+var dlUrl='',dlVer='',dlSha='';
+function log(m){var l=document.getElementById('log');l.innerText+=m+'\n';l.scrollTop=l.scrollHeight}
+function openSettings(){document.getElementById('modal').classList.add('show')}
+function closeSettings(){document.getElementById('modal').classList.remove('show')}
+function setChannel(ch){
+ channel=ch;localStorage.setItem('gca_channel',ch);
+ document.getElementById('chLabel').innerText=ch==='stable'?'Stable (发行)':ch==='beta'?'Beta (测试)':'Nightly (开发)';
+ closeSettings();checkUpdate()
+}
+function checkUpdate(){
+ log('channel: '+channel+' checking manifest...');
+ var j=JSON.parse(Android.fetchManifest(channel));
+ if(j.error){log('ERR: '+j.error);return}
+ var h5=j.h5;log('latest: '+h5.latest+' min: '+h5.min_version);
+ var v=h5.min_version.replace(/[^0-9]/g,''),my=(document.getElementById('ver').innerText||'').replace(/[^0-9]/g,'');
+ if(parseInt(my||'0')<parseInt(v||'0')){log('ERR: APK too old (need v'+h5.min_version+')');return}
+ dlUrl=h5.url;dlSha=h5.sha256||'';
+ if(!dlSha||/^0{64}$/.test(dlSha)){log('ERR: channel no build');return}
+ if(h5.latest!==document.getElementById('ver').innerText){
+  dlVer=h5.latest;document.getElementById('btnApply').classList.add('show');log('*** NEW VERSION ***')}
+ else log('up to date')
+}
+function applyUpdate(){
+ log('downloading...');
+ var t=Android.fetchText(h5UrlRelative(dlUrl));
+ if(typeof t!=='string'||t.startsWith('ERROR:')){log('ERR: '+t);return}
+ var h=Android.sha256(t);
+ if(h!==dlSha){log('SHA256 MISMATCH!');return}
+ Android.saveCache(t);log('OK! restart app to apply')
+}
+function h5UrlRelative(u){var p=u.split('/ota/');return p.length>1?'h5/'+p[1].split('/h5/')[1]:u}
+document.getElementById('ver').innerText=Android.fetchManifest('stable').match(/"latest":"([^"]+)"/)[1];
+</script></body></html>
\ No newline at end of file
diff --git a/ota/manifest.json b/ota/manifest.json
new file mode 100644
index 0000000..9773e06
--- /dev/null
+++ b/ota/manifest.json
@@ -0,0 +1 @@
+{"stable":{"h5":{"latest":"0.1.0-dav-android-6","min_version":"0.1.0-dav-android-5","url":"https://git.childish-ghost.com/LukeMackin/Yuzu-GCA/raw/branch/main/ota/h5/index-stable.html","sha256":"56b0e384f53015b0a1a5eb2507fd792dfc31fe44aff40342cd8a8d3bd5c1e14a"},"apk":{"version":"0.1.0-dav-android-5","versionCode":5,"url":"https://git.childish-ghost.com/LukeMackin/Yuzu-GCA/releases/download/v0.1.0-dav-android-5/v0.1.0-dav-android-5-debug.apk","sha256":"56b0e384f53015b0a1a5eb2507fd792dfc31fe44aff40342cd8a8d3bd5c1e14a"}},"beta":{"h5":{"latest":"0.1.0-dav-android-6","min_version":"0.1.0-dav-android-5","url":"https://git.childish-ghost.com/LukeMackin/Yuzu-GCA/raw/branch/main/ota/h5/index-beta.html","sha256":"56b0e384f53015b0a1a5eb2507fd792dfc31fe44aff40342cd8a8d3bd5c1e14a"},"apk":{"version":"0.1.0-dav-android-5","versionCode":5,"url":"https://git.childish-ghost.com/LukeMackin/Yuzu-GCA/releases/download/v0.1.0-dav-android-5/v0.1.0-dav-android-5-debug.apk","sha256":"56b0e384f53015b0a1a5eb2507fd792dfc31fe44aff40342cd8a8d3bd5c1e14a"}},"nightly":{"h5":{"latest":"0.1.0-dav-android-6","min_version":"0.1.0-dav-android-5","url":"https://git.childish-ghost.com/LukeMackin/Yuzu-GCA/raw/branch/main/ota/h5/index-nightly.html","sha256":"56b0e384f53015b0a1a5eb2507fd792dfc31fe44aff40342cd8a8d3bd5c1e14a"},"apk":{"version":"0.1.0-dav-android-5","versionCode":5,"url":"https://git.childish-ghost.com/LukeMackin/Yuzu-GCA/releases/download/v0.1.0-dav-android-5/v0.1.0-dav-android-5-debug.apk","sha256":"56b0e384f53015b0a1a5eb2507fd792dfc31fe44aff40342cd8a8d3bd5c1e14a"}}}
