diff --git a/update.cpp b/update.cpp
index 8b520cb..f8cf320 100644
--- a/update.cpp
+++ b/update.cpp
@@ -216,7 +216,7 @@ Update::DownloadResult Update::sendNextAddress(int bNum) const {
         qDebug() << "addr-block" << bNum << "...";
         while (noAnswerCount <= 250) {
             m_hw->bl_sendAddress(bNum);
-            std::this_thread::sleep_for(std::chrono::milliseconds(100));
+            QThread::msleep(100);
             DownloadResult const res = sendStatus(m_hw->bl_wasSendingAddOK());
             if (res != DownloadResult::NOP) {
                 if (res == DownloadResult::ERROR) {
@@ -320,11 +320,11 @@ bool Update::startBootloader() const {
     int nTry = 5;
     while (--nTry >= 0) {
         m_hw->bl_startBL();
-        std::this_thread::sleep_for(std::chrono::milliseconds(500));
+        QThread::msleep(5000);
         m_hw->bl_checkBL();
         if (m_hw->bl_isUp()) {
             qInfo() << "starting bootloader...OK";
-            std::this_thread::sleep_for(std::chrono::milliseconds(500));
+            QThread::msleep(5000);
             return true;
         } else {
             qCritical() << "bootloader not up (" << nTry << ")";
@@ -339,7 +339,7 @@ bool Update::stopBootloader() const {
     int nTry = 5;
     while (--nTry >= 0) {
         m_hw->bl_stopBL();
-        std::this_thread::sleep_for(std::chrono::milliseconds(500));
+        QThread::msleep(500);
         if (!m_hw->bl_isUp()) {
             qInfo() << "stopping bootloader...OK";
             return true;
@@ -368,7 +368,7 @@ bool Update::resetDeviceController() const {
     qDebug() << "resetting device controller...";
     m_hw->bl_rebootDC();
     // wait maximally 3 seconds, before starting bootloader
-    QThread::msleep(1500);
+    QThread::sleep(1);
     qInfo() << "resetting device controller...OK";
     return true;
 }