S430 - Win 8.1 - WWAN Ericsson H5321 gw not working

I have a ThinkPad S430 with a WWAN card preinstalled.
The machine came with Windows 7, but I've actually wiped it and installed Win 8.1
However, I never managed to get the WWAN to work.
When I enter the device manager I see some random flashes / updates and occasionally a device shows under "Network adapters" called MbmLowExt.
It has a yellow mark giving Code 45 "Currently, this hardware device is not connected to the computer" and sometimes Code 10 "This device cannot start" (depending if the device is shown or not).
I googled this problem for ages and found a lot if similar cases, however, none of the proposed solutions fixed my issue.
I have installed the newest driver version from the Lenovo site (8.0.10.1 – dated 20 Jun 2013 - g7wo09ww.exe). This driver should actually work without a problem – however it doesn’t.
Interestingly enough the driver details of MbmLowExt show a different version (8.0.8.5 dated 07.DEC.2012).
I have also tried to upgrade the firmware using the update tool I found on the Lenovo site when looking for S430. However, the tool always failed claiming it could not find the device.
I have tried a huge number of different combinations to solve this issue. Old and newer driver versions – the compatibility trick shown here:
http://www.bibble-it.com/2012/03/17/f5521gw-wwan-install-on-windows-8-cp-lenovo-x220t
rebooted my machine several times and tried the firmware update with all different driver versions and even without driver versions.
I tired to uninstall / delete all drivers also from System32 no luck.
Anybody who managed to get the WWAN running under Windows 8.1 with the most recent drivers?
Before you as: yes the modem is installed in my machine – I can see the SIM card slot )

Sorry for the silly response but I managed to solve the problem by purchasing an HP Elitebook 840.
I believe Lenovo only benefits from the good reputation of the Thinkpads (due to the efforts from IBM)- but looking back at my personal experience with them they are just expensive with bad quality and service.
We have switched all Lenovo devices for HP and see no reason for complaint so far.
Sorry I have no better news to share...

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