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<head>
<meta name="viewport" content="width=device-width, initial-scale=1" charset="utf-8">
<title>ESP32</title>
</head>
<body>
<h2>ESP32</h2>
<hr><br>
<button id="ota" type="button" onclick="ota()">ESP32 固件升级</button>
<script>
function ota() {
window.location.href = "http://192.168.4.1/ota";
}
</script>
</body>
</html>