FIX: Windows 10 October 2018 v1809 Update Installation Failed Error 0x800F081F-0x20003 (Solved)
This tutorial contains instructions to resolve the "Windows 10 v1809 Update installation failed" problem with error "We couldn't install Windows 10. The installation failed in the SAFE_OS phase with an error during INSTALL_UPDATES operation: Error 0x800F081F" or