Microsoft Finds Bug in Windows 10 Cumulative Update KB4495666

Microsoft says it discovered a problem in the latest cumulative update for Fast ring insiders, so the company decided to put the rollout of 20H1 preview builds for these users on hold.

According to Microsoft, users running Windows 10 build 18362.53 after installing cumulative update KB4495666 can’t proceed to the Windows 10 20H1 preview builds due to errors 0xca00a000 and 0x80242016.

The problem appears to be brought on by this specific cumulative update, and Microsoft says it’s associated with the migration process when switching from 19H1 preview builds to 20H1.

“Fix coming this week”

As a result, the software giant chose to pull the 20H1 update for Fast ring insiders until a brand new cumulative update is released to solve the bug.

“We have determined that there is an issue using the Build 18362.53 (KB4495666) Cumulative Update that was released early a week ago that has caused updates to construct 18875 to fail. The problem only impacts 19H1 to 20H1 updates and occurs as a result of migration failure because the OS attempts to update towards the new build,” Microsoft explains.

“To resolve this issue, we are creating a new Cumulative Update that will have to be put on surface of Build 18362.53 first before Insiders can update towards the latest 20H1 builds. As we focus on this new Cumulative Update, we have stopped offering Build 18875 to Insiders on Build 18362.53 and holding off flighting a new 20H1 build until we can deliver the fix to unblock Insiders.”

The brand new cumulative update is anticipated now, which means that Fast ring insiders will be able to update to Windows 10 20H1 preview builds in a day or two.

Windows 10 20H1 is really a preview of the next spring update, and Microsoft previously shipped these builds towards the Skip Ahead ring exclusively. A week ago, however, Microsoft merged the Skip Ahead and Fast rings to supply both with 20H1 builds.

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