If free space is still insufficient (needs at least 50–100 MB free), enlarge it using a third-party partition tool (e.g., from a live USB, or MiniTool Partition Wizard ) because Disk Management cannot resize the SRP directly.
Here’s a concise write-up explaining the issue, its causes, and step-by-step solutions for error on Windows 11. we couldn't update the system reserved partition windows 11