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suleman2163604's avatar
suleman2163604
Copper Contributor
Jun 22, 2026

Windows 11 Insider Preview Feature Update (26220.8690)

attempted to install Windows update 26220.8690, but it failed with an error stating that the system couldn’t update the system reserved partition (SRP). About two weeks earlier, your C drive was running out of space, so you tried to merge the C and D drives. During that process, you encountered issues with the system reserved partition, which prevented the merge then I deleted the system reserved partition to proceed with combining the drives. As a result, the system is now missing or has a corrupted SRP, which is essential for Windows updates and boot-related files. 

my other other updates like framework, security and 25H2 is working but only Windows update 26220.8690 is failed.

how it will manage?

1 Reply

  • Rakkxunsuop's avatar
    Rakkxunsuop
    Iron Contributor
    Jul 01, 2026

    Open Disk Management (diskmgmt.msc) and verify if the System Reserved partition is present. It typically appears as a small (~100MB) partition marked as "System Reserved."