I just spend 3 hours trying to upgrade to Windows 10 on my lenovo X1 Carbon touch (2014 model).
The upgrade failed with error code 80240020 – Lots of suggestion on the net about deleting all content from the download folder in c:\windows\softwaredistribution. That didn’t work 🙁
The culprit turned out to be the driver for the builtin 4G LTE modem. From Sierra Wireless, the EM7345. This software have not been update by Lenovo System Update.
Download from:
