Microsoft has in the end showed that it’s conscious about a topic the place Home windows 11’s Might 2026 Replace (KB5089549) fails to put in because of mistakes corresponding to 0x800f0922, 0x80240069, 0x80240031, amongst others. Fortunately, Microsoft is rolling out an emergency server-side replace to handle those mistakes.
Home windows 11 KB5089549 is a compulsory replace that’s meant to put in mechanically on all PCs, however in some instances, it refuses to put in.
In an up to date fortify report, Microsoft famous that Home windows 11’s Might 2026 Replace set up starts while you click on the obtain button, and it in most cases reboots to complete making use of the adjustments. You’ll be at the spinning circle display, very similar to the screenshot under:
Within the above case, Home windows Replace is at 2% and is safely transferring ahead, however the set up may mechanically get caught at roughly 35-36%, and Home windows will start rolling again the adjustments. If Home windows doesn’t roll again the replace, your PC may now not boot accurately or may really feel slower than earlier than.
You’ll see “one thing didn’t pass as deliberate. Undoing adjustments” to your display, and Home windows will boot again to the desktop.
Why is the Home windows 11 KB5089549 replace failing because of 0x800f0922?
In our assessments, Home windows Newest discovered that the computer virus is particularly hitting PCs with low EFI (Extensible Firmware Interface) partition house, and there’s a possibility the issue is fashionable.
When you open Home windows Replace, you’ll understand error code 0x800f0922, and Tournament Viewer will log the whole lot inside of C:WindowsLogsCBSCBS.log with the next main points:
SpaceCheck: Inadequate unfastened house ServicingBootFiles failed. Error = 0x70 SpaceCheck: utilized by third-party/OEM information outdoor of Microsoft boot directories Workaround
For the ones unaware, EFI Machine Partition (ESP), often referred to as EFI, is a compulsory function of Home windows, and it’s nearly all the time pre-installed, nevertheless it in most cases takes not more than 100MB of your disk house. ESP is used to retailer the boot information your PC calls for in addition Home windows 11, and Microsoft deliberately hides it, so that you don’t unintentionally use the partition.
Alternatively, Home windows Newest understands that the 100MB house, which is assumed to be greater than sufficient, can run out when firmware updates launched via OEMs go away cumbersome information at the back of or while you set up more than one Home windows variations and even Linux. In the ones instances, Home windows 11 KB5089549 (Might 2026 Replace) may fail to put in.
You may also run into different doable issues in the event you set up Home windows 11 KB5089549 and your unfastened EFI garage is lower than 10MB.
You’ll be able to’t pass to Record Explorer and right-click one of the crucial volumes to determine the present EFI space for storing as a result of Home windows mechanically hides the partition for protection causes, however you’ll use a PowerShell script to peek inside of. To test your EFI garage prior to installing per month updates, open PowerShell (admin) and run the next script:
Get-Partition | The place-Object GptType -eq '{c12a7328-f81f-11d2-ba4b-00a0c93ec93b}' | Get-Quantity | Layout-Listing Dimension, SizeRemaining
On my PC, Home windows 11 returned a complete dimension of 268,435,456 bytes, which converts to 256MB, and to be had unfastened house of 126,996,480 bytes, which interprets to 121MB. That is a ways above the desired unfastened house for Home windows Updates, which is no less than 11MB. In case your garage is lower than 10MB, Home windows Updates may fail to put in.
In a Comments Hub submit, one consumer famous that their PC is caught in a boot loop whilst putting in KB5089549. The machine restarts 3 times consecutively, fails to finish the replace, and rolls again adjustments.
“It helps to keep forcing me to retry the set up,” they added.
“I’ve attempted putting in this replace and each instances it went thru to 100% put in after which messaged that it discovered an issue and to not concern it could attempt to get better/roll again the replace. I attempted restarting manually via bodily urgent down and holding pressed down the On /Off button and it in the end recovered. Home windows historical past occasionally confirmed the replace as failed, however the remaining time simply didn’t file at the replace. Home windows troubleshooter can’t in finding any drawback,” every other pissed off consumer added.
Microsoft rolls out emergency replace to handle Might 2026 replace problems
Microsoft recommends expanding the dimensions of the ESP via enhancing the Home windows Registry, however I don’t suppose it’s essential as a result of a server-side replace has in the end patched the issue.
“This factor is mitigated the usage of Identified Factor Rollback (KIR),” Microsoft famous. “The solution has already propagated mechanically to shopper units and non-managed trade units. Restarting your Home windows software may lend a hand the solution observe extra briefly.”
Microsoft informed Home windows Newest that it’s now not conscious about every other insects, suggesting it’s denying unverified experiences of web issues.
