Windows 10 Windows 10 Upgrade to 21H2 fails with Error 0xC1900101 - 0x30017

  • Thread starter Thread starter WolfKsk
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WolfKsk

Every attempt to upgrade Windows 10 from 20H2 to 21H2 rolls back with Error 0xC1900101 - 0x30017. I've tried all the recommended workarounds, freed 12GB of space, uninstalled anti-virus, disabled Microsoft Defender, disabled the Internet, cleared SoftwareDistribution and catroot2 to no avail. The install gets to about 30% after the reboot in phase 1 and then rolls back.The end of setuperr.log reports problems with 4 registry keys. Are these critical to the install and can they be fixed?Since Windows Update will not serve up 21H1 or 21H2, is it maybe seeing a compatibility problem that Set

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