1) The files are downloaded
2) Every steps before reboot goes successful

**Couldn't update to Windows 8.1**
Sorry, we couldn't complete the update to Windows 8.1. We've restored your previous version of Windows to this PC.
0x80073B92 - 0x20009

1) Downloaded all updates, drivers and apps
2) Removed cache using wsreset.exe
3) Checked if multiple HDD exists (single 1TB HDD exists)
4) Synced Licenses
5) and other stuffs