KDE 4.5.4 Networkmanager crahes while installing mobile connection

Hello Community!

Since this is my first post here let me introduce short:
I am a long time gentoo-user (~10 years). Just bought this new laptop and don’t want to take the time to compile everything. During my search for a nice binary distro, I found the KDE reloaded CD, which I then downloaded. That was because I had a great hassle to find a Distro which supports the latest KDE, I was used by gentoo.
Well, I am very impressed: Installation went flawless and the Distro is very up-to-date.

Well, now to one of my problems:
I have this mobile internet stick:

ID 12d1:140c Huawei Technologies Co., Ltd.

which also gets detected as a modem. So far so good.
When I now try to set it up, the KDE networmanager just segfaults badly…
This is the output from the error report:

Any help would be appreciated. If more information is needed, just tell me.
Maybe there is a possibility to set it up command line?

Application: KDE-Kontrollmodul (kdeinit4), signal: Segmentation fault
[KCrash Handler]
#6  0x00007f60ca29ea7a in ?? () from /usr/lib64/kde4/kcm_networkmanagement.so
#7  0x00007f60ca2981c1 in ?? () from /usr/lib64/kde4/kcm_networkmanagement.so
#8  0x00007f60de2bb87f in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib64/libQtCore.so.4
#9  0x00007f60dd81f7b5 in QComboBox::currentIndexChanged(QString const&) () from /usr/lib64/libQtGui.so.4
#10 0x00007f60dd81f805 in QComboBoxPrivate::_q_emitCurrentIndexChanged(QModelIndex const&) () from /usr/lib64/libQtGui.so.4
#11 0x00007f60dd81f94f in QComboBoxPrivate::setCurrentIndex(QModelIndex const&) () from /usr/lib64/libQtGui.so.4
#12 0x00007f60dd81fa7c in QComboBox::setCurrentIndex(int) () from /usr/lib64/libQtGui.so.4
#13 0x00007f60dd823ae9 in QComboBox::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libQtGui.so.4
#14 0x00007f60de2bb87f in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib64/libQtCore.so.4
#15 0x00007f60de303124 in QAbstractItemModel::rowsInserted(QModelIndex const&, int, int) () from /usr/lib64/libQtCore.so.4
#16 0x00007f60de2a115c in QAbstractItemModel::endInsertRows() () from /usr/lib64/libQtCore.so.4
#17 0x00007f60dd9eda03 in QStandardItemModelPrivate::rowsInserted(QStandardItem*, int, int) () from /usr/lib64/libQtGui.so.4
#18 0x00007f60dd9eeae4 in QStandardItemPrivate::insertRows(int, int, QList<QStandardItem*> const&) () from /usr/lib64/libQtGui.so.4
#19 0x00007f60dd822b2c in QComboBox::insertItem(int, QIcon const&, QString const&, QVariant const&) () from /usr/lib64/libQtGui.so.4
#20 0x00007f60dd823281 in QComboBox::insertSeparator(int) () from /usr/lib64/libQtGui.so.4
#21 0x00007f60ca29fbe2 in ?? () from /usr/lib64/kde4/kcm_networkmanagement.so
#22 0x00007f60dd94832c in QWizardPrivate::switchToPage(int, QWizardPrivate::Direction) () from /usr/lib64/libQtGui.so.4
#23 0x00007f60dd948b28 in QWizard::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libQtGui.so.4
#24 0x00007f60ca298140 in ?? () from /usr/lib64/kde4/kcm_networkmanagement.so
#25 0x00007f60de2bb87f in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib64/libQtCore.so.4
#26 0x00007f60ddac1f12 in QAbstractButton::clicked(bool) () from /usr/lib64/libQtGui.so.4
#27 0x00007f60dd80593b in QAbstractButtonPrivate::emitClicked() () from /usr/lib64/libQtGui.so.4
#28 0x00007f60dd80624f in QAbstractButton::click() () from /usr/lib64/libQtGui.so.4
#29 0x00007f60dd905ca8 in QDialog::keyPressEvent(QKeyEvent*) () from /usr/lib64/libQtGui.so.4
#30 0x00007f60dd4b9720 in QWidget::event(QEvent*) () from /usr/lib64/libQtGui.so.4
#31 0x00007f60dd467c94 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#32 0x00007f60dd470952 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#33 0x00007f60def29816 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#34 0x00007f60de2a662c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#35 0x00007f60dd50949a in QKeyMapper::sendKeyEvent(QWidget*, bool, QEvent::Type, int, QFlags<Qt::KeyboardModifier>, QString const&, bool, int, unsigned int, unsigned int, unsigned int, bool*) ()
   from /usr/lib64/libQtGui.so.4
#36 0x00007f60dd50991d in QKeyMapperPrivate::translateKeyEvent(QWidget*, _XEvent const*, bool) () from /usr/lib64/libQtGui.so.4
#37 0x00007f60dd4e5b0c in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib64/libQtGui.so.4
#38 0x00007f60dd50d942 in x11EventSourceDispatch(_GSource*, int (*)(void*), void*) () from /usr/lib64/libQtGui.so.4
#39 0x00007f60d9e0ea93 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#40 0x00007f60d9e0f270 in ?? () from /usr/lib64/libglib-2.0.so.0
#41 0x00007f60d9e0f510 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#42 0x00007f60de2d131f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#43 0x00007f60dd50d5de in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtGui.so.4
#44 0x00007f60de2a5a62 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#45 0x00007f60de2a5c75 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#46 0x00007f60dd904f3e in QDialog::exec() () from /usr/lib64/libQtGui.so.4
#47 0x00007f60ca299470 in ?? () from /usr/lib64/kde4/kcm_networkmanagement.so
#48 0x00007f60ca298034 in ?? () from /usr/lib64/kde4/kcm_networkmanagement.so
#49 0x00007f60de2bb87f in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib64/libQtCore.so.4
#50 0x00007f60ddac1f12 in QAbstractButton::clicked(bool) () from /usr/lib64/libQtGui.so.4
#51 0x00007f60dd80593b in QAbstractButtonPrivate::emitClicked() () from /usr/lib64/libQtGui.so.4
#52 0x00007f60dd806f0b in QAbstractButtonPrivate::click() () from /usr/lib64/libQtGui.so.4
#53 0x00007f60dd80717c in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib64/libQtGui.so.4
#54 0x00007f60dd4b969c in QWidget::event(QEvent*) () from /usr/lib64/libQtGui.so.4
#55 0x00007f60dd467c94 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#56 0x00007f60dd470aaa in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#57 0x00007f60def29816 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#58 0x00007f60de2a662c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#59 0x00007f60dd468c95 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from /usr/lib64/libQtGui.so.4
#60 0x00007f60dd4e7668 in QETWidget::translateMouseEvent(_XEvent const*) () from /usr/lib64/libQtGui.so.4
#61 0x00007f60dd4e5d49 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib64/libQtGui.so.4
#62 0x00007f60dd50d942 in x11EventSourceDispatch(_GSource*, int (*)(void*), void*) () from /usr/lib64/libQtGui.so.4
#63 0x00007f60d9e0ea93 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#64 0x00007f60d9e0f270 in ?? () from /usr/lib64/libglib-2.0.so.0
#65 0x00007f60d9e0f510 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#66 0x00007f60de2d131f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#67 0x00007f60dd50d5de in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtGui.so.4
#68 0x00007f60de2a5a62 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#69 0x00007f60de2a5c75 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#70 0x00007f60dd904f3e in QDialog::exec() () from /usr/lib64/libQtGui.so.4
#71 0x00007f60d08d8ddd in kdemain () from /usr/lib64/libkdeinit4_kcmshell4.so
#72 0x00000000004074a9 in _start ()

If this is a USB device, it looks like you may need to use usb_modeswitch. I found a thread here about it, but seems a little old. I would read ALL of the messages, including the second page. Consider that this is not the normal device I run into these days:

USB_ModeSwitch ~ View topic - Huawei 12d1:140c from Virgin Mobile under Slackware 12.2.

Thank You,