diff --git a/app/src/main/java/io/nekohasekai/sagernet/fmt/v2ray/StandardV2RayBean.java b/app/src/main/java/io/nekohasekai/sagernet/fmt/v2ray/StandardV2RayBean.java
index 45107233..46b37ecf 100644
--- a/app/src/main/java/io/nekohasekai/sagernet/fmt/v2ray/StandardV2RayBean.java
+++ b/app/src/main/java/io/nekohasekai/sagernet/fmt/v2ray/StandardV2RayBean.java
@@ -105,9 +105,8 @@ public void initializeDefaultValues() {
 
     @Override
     public void serialize(ByteBufferOutput output) {
-        output.writeInt(0);
+        output.writeInt(1);
         super.serialize(output);
-
         output.writeString(uuid);
         output.writeString(encryption);
         if (this instanceof VMessBean) {
@@ -211,11 +210,33 @@ public void deserialize(ByteBufferInput input) {
             realityShortId = input.readString();
         }
 
-        enableECH = input.readBoolean();
-        if (enableECH) {
-            enablePqSignature = input.readBoolean();
-            disabledDRS = input.readBoolean();
-            echConfig = input.readString();
+        if (version >= 1) { // 从老版本升级上来
+            enableECH = input.readBoolean();
+            if (enableECH) {
+                enablePqSignature = input.readBoolean();
+                disabledDRS = input.readBoolean();
+                echConfig = input.readString();
+            }
+        }
+
+        if (version == 0) {
+            // 从老版本升级上来但是 version == 0, 可能有 enableECH 也可能没有，需要做判断
+            int position = input.getByteBuffer().position(); // 当前位置
+
+            boolean tmpEnableECH = input.readBoolean();
+            int tmpPacketEncoding = input.readInt();
+
+            input.setPosition(position); // 读后归位
+
+            if (tmpPacketEncoding != 1 && tmpPacketEncoding != 2) {
+                input.getByteBuffer().position(position);
+                enableECH = tmpEnableECH;
+                if (enableECH) {
+                    enablePqSignature = input.readBoolean();
+                    disabledDRS = input.readBoolean();
+                    echConfig = input.readString();
+                }
+            } // 否则后一位就是 packetEncoding
         }
 
         packetEncoding = input.readInt();