diff --git a/update.cpp b/update.cpp
index 7f87658..7a4749e 100644
--- a/update.cpp
+++ b/update.cpp
@@ -494,6 +494,88 @@ QStringList Update::getDcSoftAndHardWareVersion() {
                          << "DC SW-version not available";
 }
 
+QString Update::getFileVersion(QString const& jsonFileName) {
+    // "version":"15.10.2023 14:55 02.00.06",
+    static const QRegularExpression re("^.*(\\\"version\\\":)(.*)$");
+
+    QString fileVersion;
+    QFile inputFile(jsonFileName);
+    if (inputFile.open(QIODevice::ReadOnly)) {
+       QTextStream in(&inputFile);
+       while (!in.atEnd()) {
+          QString line = in.readLine();
+
+          QRegularExpressionMatch match;
+          int idx = line.indexOf(re, 0, &match);
+          if (idx != -1) {
+              fileVersion = match.captured(match.lastCapturedIndex());
+              break;
+          }
+       }
+       inputFile.close();
+    }
+
+    return fileVersion;
+}
+
+bool Update::checkDownloadedJsonVersions(QStringList const& jsonFileNames) {
+
+    for (QStringList::size_type i=0; i < jsonFileNames.size(); ++i) {
+
+        uint8_t jsonNr = 0;
+        QFileInfo fInfo(jsonFileNames[i]);
+
+        if (fInfo.fileName().endsWith("conf.json")) {
+            jsonNr = 1;
+        } else
+        if (fInfo.fileName().endsWith("device.json")) {
+            jsonNr = 2;
+        } else
+        if (fInfo.fileName().endsWith("cash.json")) {
+            jsonNr = 3;
+        } else {
+            QRegularExpressionMatch match;
+            static const QRegularExpression re("^(.*print)([0-3][0-9])\\.json\\s*$");
+            int idx = fInfo.fileName().indexOf(re, 0, &match);
+            if (idx != -1) {
+                QString captured = match.captured(match.lastCapturedIndex());
+                bool ok = false;
+                int n = captured.toInt(&ok);
+                if (ok) {
+                    jsonNr = n + 4;
+                }
+            }
+        }
+
+        qCritical() << __PRETTY_FUNCTION__ << fInfo.fileName() << "jsonNr" << jsonNr;
+
+        if (jsonNr != 0) {
+
+            m_hw->sys_requestJsonVersions(jsonNr);
+            QThread::msleep(500);
+
+            char buf[64];
+            memset(buf, 0x00, sizeof(buf));
+            m_hw->sys_getJsonVersions(jsonNr, buf);
+            buf[sizeof(buf)-1] = '\0';
+
+            QString const installedVersion(buf);
+            QString const fileVersion = getFileVersion(jsonFileNames[i]);
+
+            qCritical() << "installed version:" << installedVersion;
+            qCritical() << "     file version:" << fileVersion;
+
+            if (installedVersion == fileVersion) {
+
+            }
+        } else {
+            qCritical() << "CANNOT FIND JSON-NR FOR" << jsonFileNames[i];
+        }
+    }
+
+    return false;
+}
+
 bool Update::doUpdate(int &displayIndex, QStringList const &filesToWorkOn) {
     if (m_sys_areDCdataValid == false) {
         qCritical() << "ERROR!!! DC DATA NOT VALID -> CA-MASTER-PLUGIN NOT CONNECTED";