diff --git a/LedOK/device/upgradeapkdialog.cpp b/LedOK/device/upgradeapkdialog.cpp
index 9a2a658..fa0e163 100644
--- a/LedOK/device/upgradeapkdialog.cpp
+++ b/LedOK/device/upgradeapkdialog.cpp
@@ -274,7 +274,7 @@ UpgradeApkDialog::UpgradeApkDialog(QWidget *parent) : QDialog(parent) {
             json.insert("packageName", strApkName);
             auto reply = NetReq("http://"+item->mCard.ip+":2016/settings").timeout(120000).post(json);
             connect(reply, &QNetworkReply::finished, this, [reply, item, strApkName] {
-                QString err = errStrWithData(reply);
+                QString err = checkReplyForJson(reply, "error");
                 if(! err.isEmpty()) {
                     item->setResult(tr("Uninstall error")+": "+err, Qt::red);
                     return;
diff --git a/LedOK/globaldefine.cpp b/LedOK/globaldefine.cpp
index 3071763..b494352 100644
--- a/LedOK/globaldefine.cpp
+++ b/LedOK/globaldefine.cpp
@@ -1,6 +1,7 @@
 #include "globaldefine.h"
 #include "devicepanel.h"
 #include "deviceitem.h"
+#include "gutil/qnetwork.h"
 #include <QDir>
 #include <QDateTime>
 #include <QCoreApplication>
@@ -24,25 +25,8 @@ DeviceItem *findItem(QString id) {
     return 0;
 }
 
-QString replyErr(QNetworkReply *reply) {
-    reply->deleteLater();
-    auto error = reply->error();
-    if(error != QNetworkReply::NoError) {
-        auto errStr = reply->errorString();
-        if(error!=QNetworkReply::InternalServerError || ! errStr.endsWith("replied: Unknown")) {
-            if(error==QNetworkReply::OperationCanceledError) {
-                error = QNetworkReply::TimeoutError;
-                errStr = QCoreApplication::translate("Def","Connection Timeout");
-            }
-            return QString(QMetaEnum::fromType<QNetworkReply::NetworkError>().valueToKey(error))+" ("+QString::number(error)+") "+errStr;
-        }
-    }
-    auto status = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
-    if(status != 200) return QString::number(status)+" "+reply->attribute(QNetworkRequest::HttpReasonPhraseAttribute).toString();
-    return "";
-}
 QString checkReply(QNetworkReply *reply, QJsonDocument *outJson) {
-    auto err = replyErr(reply);
+    auto err = errStr(reply);
     if(! err.isEmpty()) {
         auto data = reply->readAll();
         if(! data.isEmpty()) err = err+"\n"+QCoreApplication::translate("Def","Device replied")+": "+data;
@@ -57,7 +41,7 @@ QString checkReply(QNetworkReply *reply, QJsonDocument *outJson) {
     return "";
 }
 QString checkReplyForJson(QNetworkReply *reply, QJsonDocument *outJson, QByteArray *outData) {
-    auto err = replyErr(reply);
+    auto err = errStr(reply);
     auto data = reply->readAll();
     if(outData) *outData = data;
     if(! err.isEmpty()) {
@@ -71,6 +55,22 @@ QString checkReplyForJson(QNetworkReply *reply, QJsonDocument *outJson, QByteArr
     if(outJson) outJson->swap(json);
     return "";
 }
+QString checkReplyForJson(QNetworkReply *reply, QString errField) {
+    auto err = errStr(reply);
+    auto data = reply->readAll();
+    if(! err.isEmpty()) {
+        if(! data.isEmpty()) err = err+"\n"+QCoreApplication::translate("Def","Device replied")+": "+data;
+        return err;
+    }
+    QJsonParseError jsonErr;
+    QJsonDocument json = QJsonDocument::fromJson(data, &jsonErr);
+    if(jsonErr.error != QJsonParseError::NoError) return "Json error: "+jsonErr.errorString()+"\n"+QCoreApplication::translate("Def","Device replied")+": "+data;
+    if(! json["success"].toBool()) {
+        auto errStr = json[errField].toString();
+        return QCoreApplication::translate("Def","Fail")+". "+QCoreApplication::translate("Def","Device replied")+": "+(errStr.isEmpty() ? data : errStr);
+    }
+    return "";
+}
 
 quint64 dirFileSize(const QString &path) {
     QDir dir(path);
diff --git a/LedOK/globaldefine.h b/LedOK/globaldefine.h
index 7cec49f..1ead39e 100644
--- a/LedOK/globaldefine.h
+++ b/LedOK/globaldefine.h
@@ -83,9 +83,9 @@ inline int verCompare(const QString& a, const QString& b) {
     return aparts.count() > bparts.count() ? aparts[cnt].toInt() : bparts[cnt].toInt();
 }
 
-QString replyErr(QNetworkReply *);
 QString checkReply(QNetworkReply *, QJsonDocument * = 0);
 QString checkReplyForJson(QNetworkReply *, QJsonDocument * = 0, QByteArray * = 0);
+QString checkReplyForJson(QNetworkReply *, QString errField);
 
 #define Def_CtrlReqPre \
     waitingDlg->show();\
diff --git a/LedOK/gutil/qnetwork.h b/LedOK/gutil/qnetwork.h
index 70386a7..a2e15cb 100644
--- a/LedOK/gutil/qnetwork.h
+++ b/LedOK/gutil/qnetwork.h
@@ -18,8 +18,9 @@ public:
     explicit NetReq(QNetworkAccessManager *access) : mAccess(access) {};
 #else
     NetReq() {init();};
-    explicit NetReq(QNetworkAccessManager *access) : mAccess(access) {init();};
+    explicit NetReq(const QString &url) : QNetworkRequest{url} {init();};
     explicit NetReq(const QUrl &url) : QNetworkRequest{url} {init();};
+    explicit NetReq(QNetworkAccessManager *access) : mAccess(access) {init();};
     inline void init() {
         setAttribute(QNetworkRequest::RedirectPolicyAttribute, QNetworkRequest::NoLessSafeRedirectPolicy);
     }