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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 runn...
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."