![]() ![]() To help speed up the process, we used an autounattend.xml file that just so happened to be provided by a Microsoft employee assisting us. For many reasons I rather not list here, my org had to install Windows 10 via USB drives on thousands of new laptops a while back. They did confirm with us that their teams will work on updating all the documentation required but who knows how long that will take. After going back and forth with Microsoft Support and performing many tests, their product team finally informed us that an EFI partition sized at 100MB is too small. Though, you'd be lucky if those steps free up enough space. Microsoft has another article HERE about freeing space in the EFI partition. Unfortunately, due to third-party software using that partition more than ever, along with new Widows 11 needs, 100MB isn't enough space anymore. Windows 11 needs at least 15MB of free space in the EFI partition to upgrade to Windows 11. While there seems to be no standard, manufacturers and the default Windows installation tend to set it around 500MB. According to Microsoft, the minimum size of the EFI partition should be 100MB, as outlined in THIS article. After weeks of troubleshooting and talking with several Microsoft product teams, we have finally uncovered the problem and its original cause. Confused, we reached out to Microsoft for some help. ![]() It would either tell us to replace the system drive or show the error "We couldn’t update system reserved partition". ![]() Utilizing reports available in Intune, thousands of our new devices were ineligible for Windows 11. Recently, my org has been preparing to upgrade all our devices to Windows 11 in the coming months. This could be a new requirement as I have updated several devices to Windows 11 before, but now, those same models can no longer update due to this issue. For those curious, the EFI system partition is what computers use to boot and talk with UEFI BIOS. One lesser know requirement (possibly new) not documented (yet) by Microsoft is the size of the EFI system partition. We all know the (somewhat crazy) requirements to run Windows 11. If you have ever used an autounattend.xml to install Windows from a USB, it's likely the EFI partition is too small. TLDR: If the EFI partition on the system is too small, Windows 10 devices can not update to Windows 11 through a standard feature update. If you have installed Windows 10 using a USB drive with an autounattend.xml file on it, this may pique your interest. ![]()
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