How to update Windows 11 to 25H2 manually from old windows version?

Because your processor isn't officially supported, even if you manage to update Windows 11 to 25H2 manually, there could be stability or compatibility issues afterward. Microsoft’s official stance is to support specific hardware configurations, so proceed with caution and back up your data.

How to update Windows 11 to 25H2 manually:

1. Windows Update for Business or WSUS:
   If this is a corporate or managed device, sometimes updates can be pushed through organization channels. You can consult your IT administrator.
2. Using the Media Creation Tool or ISO (without registry edits):
   You mentioned avoiding registry edits and bypasses, so the most straightforward way remains updating via Windows Update. Since your system isn't receiving the update automatically, this indicates compatibility checks are preventing the upgrade.
3. Check for Optional Updates:
   Sometimes, feature updates like 25H2 are available as optional updates. Go to:
   Settings > Windows Update > Advanced options > Optional updates
   and see if the update appears there.
4. Ensure Your Windows is Fully Up-to-Date:
   Sometimes, installing the latest cumulative updates can trigger the availability of feature updates.