Microsoft in the past showed that the per month cumulative updates, in particular the Might 2026 replace, are failing on some PCs with inadequate EFI Device Partition area. Now, the corporate says it has recognized the foundation motive and is rolling out a repair with an non-compulsory replace (KB5089573). In case you set up the non-compulsory replace, you must not run into issues.
On Might 12, 2026, Microsoft rolled out the Patch Tuesday replace (KB5089549) for Home windows 11 25H2, 24H2, and older variations. The Might 2026 Replace shipped with some noteworthy adjustments, together with Xbox mode for desktop and explorer.exe-related fixes. Alternatively, on the similar time, somewhat a couple of customers complained that they may now not set up the replace.
Whilst KB5089549 (Might 2026 Patch) put in easily on my PC, I heard from shoppers that they have been not able to put in the required replace because of a obscure error code, “0x800f0922,” which most often happens when your software has restricted unfastened area on a partition referred to as the EFI (Extensible Firmware Interface) Device Partition, often referred to as ESP.
Home windows 11 mandates ESP, and it’s provide on all PCs without reference to the OEM or Home windows model you utilize
ESP is needed as a result of Home windows makes use of it to learn boot recordsdata. UEFI firmware depends upon a particular FAT32-formatted partition (the ESP), which incorporates the Home windows Boot Supervisor. You’ll’t boot your PC with out it since the {hardware} firmware depends upon it to start out Home windows.
That’s why ESP is at all times created mechanically while you arrange Home windows, and hidden in Document Explorer as it’s a delicate/vital partition. It takes only some megabytes of area. As an example, my Home windows set up has allotted best 256MB to ESP, and I’ve greater than 100MB of unfastened area within the partition.
You’ll take a look at ESP garage in your PC the usage of the next command:
Get-Partition | The place-Object GptType -eq '{c12a7328-f81f-11d2-ba4b-00a0c93ec93b}' | Get-Quantity | Layout-Record Dimension, SizeRemaining
Alternatively, when the EFI (Extensible Firmware Interface) Device Partition (ESP) runs out of area, Home windows updates can fail because of a up to date alternate.
This factor used to be offered with Home windows 11’s Might 2026 Replace, and Microsoft instructed us that it in an instant rolled again the buggy or modified code by way of a server-side replace.
Now, Microsoft has shared some extra main points. In case you have been affected, or for those who get affected at some point, Home windows updates would nonetheless obtain correctly, however while you reboot the software to complete making use of adjustments, it could get caught at roughly 35–36% completio.
At that time, you’ll see the spinning circle display screen, and Home windows will try to roll again the adjustments.
That implies you’ll run into the message, “One thing didn’t pass as deliberate. Undoing adjustments,” and the Home windows Replace historical past web page will log the failure with error code 0x800f0922.
In case you use Tournament Viewer and take a look at C:WindowsLogsCBSCBS.log, you’ll additionally understand that Home windows flagged the problem as inadequate unfastened area at the EFI Device Partition.
Why can ESP run out of garage and ruin Home windows updates?
Home windows does now not regularly devour ESP garage, which is why this partition generally has a disk footprint of lower than 100MB whilst nonetheless conserving 60–80% unfastened area. Alternatively, in some instances, it will possibly develop in dimension and in the end finally end up breaking Home windows Replace installations. It will occur while you set up updates launched through OEMs, akin to BIOS updates.
In case you have 10MB or much less of to be had area in ESP, Home windows updates might fail to put in.
You’ll at all times take the tougher path and manually build up the dimensions of the ESP, however you shouldn’t do this except you understand precisely what you’re doing. Fortunately, Microsoft has discovered the way to maintain the issue, so that you don’t have to switch your ESP to put in updates.
In an up to date report, the corporate says the Might 2026 non-compulsory replace (KB5089573 / Construct 26200.8524 or more moderen) addresses the foundation motive, and ESP area problems must not halt your per month updates.
Microsoft says you must set up this replace if earlier updates, just like the Might 2026 Patch Tuesday, failed.
“This factor used to be resolved through Home windows updates launched Might 26, 2026 (KB5089573), and later,” Microsoft stated. “We advise you put in the most recent replace in your software because it incorporates essential enhancements and factor resolutions, together with this one.”
It’s value noting that Microsoft says all long run updates may even come with the repair for Home windows Replace screw ups. So for those who don’t wish to set up an non-compulsory replace, you’ll be able to skip it and nonetheless obtain the repair within the subsequent Patch Tuesday replace, which is scheduled for June 9, 2026.
