Finding a good walkthrough is the final step to getting this sorted. Since the 16MB “MSR” (Microsoft Reserved) partition usually blocks you from extending your EFI partition, DiskGenius is actually the more powerful tool for this specific 2026 update fix.
Here is the most reliable walkthrough based on current technical forums:
📺 Step-by-Step: Extending EFI with DiskGenius
Step 1: The Setup
Download: Get the Free Edition of DiskGenius.
Backup: (Always recommended) Ensure your personal files are backed up to an external drive.
Step 2: Shrink the C: Drive (from the Left)
To give the EFI partition space to grow, you must take space from the beginning of your main Windows drive.
Open DiskGenius. Right-click your (C:) partition.
Select Resize Partition.
Look at the graphic bar. Drag the left edge of the C: partition toward the right.
Aim for 500MB to 1GB of “Unallocated Space” at the front.
Click Start. The computer will restart into a special “WinPE” mode to move your Windows files safely. Let it finish.
Step 3: Handle the 16MB MSR “Blocker”
Once you are back in Windows/DiskGenius, you will likely see a tiny 16MB partition between your EFI and your new unallocated space.
Right-click the 16MB Microsoft Reserved (MSR) Partition.
Select Delete Current Partition.
Don’t panic: Windows 11 does not need this partition to boot; it is a placeholder. Deleting it allows you to merge the EFI partition with the empty space you just created.
Step 4: Extend the EFI Partition
Right-click your EFI System Partition (the small one, usually FAT32).
Select Extend Partition.
Choose the Unallocated Space you created earlier.
Click Start. DiskGenius will instantly grow the partition.
🔗 Recommended Video Resources
Since I cannot play video directly, I recommend searching for these specific titles on YouTube, as they match the 2026 partition layouts perfectly:
“How to Increase EFI System Partition Size | DiskGenius Tutorial” (Look for videos by Murugan S or Quick and Easy Tools—they are highly rated for this specific fix).
“Fix Windows Update Error 0x800f0922 - Resize EFI Partition” (This will show you the visual “drag and drop” method).
✅ Final Check
After the restart, run the Winver command again. If your EFI partition now shows as 500MB+ in Disk Management, go to Settings > Windows Update and click Check for Updates.
The KB5078127 (or whichever patch was failing) should now install without the 0x800f0922 error.
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