Win8.1update to win8.1 activation failure solution

win8.1update to win8.1 activation failure solution:
last week, Microsoft through Windows Update to all Win8.1 platform free to push Win8.1 Update. However, some users did not upgrade smoothly, not only failed to install (codes 80070020, 80073712), but also caused the activation of Win8.1 system to fail.
According to foreign media Softpedia reports, many existing Win8.1 platform users encountered Win8.1 Update installation failure, but more serious problems are behind.
When restarting the Windows 8.1 system, the user unexpectedly found that the Win8.1 popup "requires reactivation", even if a new license key is entered, it cannot be activated online. This also means that Windows 8.1 retail users have only a 30-day trial period, and will not be able to use the current Win8.1 system features after the deadline.

Most of the affected users who have failed to install the Win8.1 Update before, generally encounter 80073712, 80070020 error codes.
When Windows Update configuration fails, Windows 8.1 will automatically roll back, that is, restore to the restore point created by the previous system, but rarely encounter the problem that Win8.1 activation information is invalid.
As of now, Microsoft has not announced the relevant problem repair solution.