upd

com.sharemao.web.xw3/src/main/webapp/activation.jsp

@@ -41,7 +41,7 @@
     <div class="logon-input">
       <div class="input">
         <div class="title">设备号</div>
-        <input type="tel" placeholder="请输入设备号" id="sn" name="devid" inputmode="numeric">
+        <input type="tel" placeholder="请输入设备号" id="sn" name="devid" value="${sn}" inputmode="numeric">
         <img src="/static/img/saoyisao.jpg" class="qrscan">
       </div>
       <div class="input">