Microsoft won’t allow upgrading to Windows 11 if the users are using the applications that create registry keys using some non-ASCII characters.
Microsoft explained that the affected systems running on Windows 11 21H2 experienced blue screens or other issues.
The company further explained that,
There is a compatibility issue among the apps that use some sort of non-ASCII character in their registry keys or subkeys and the Windows 11 Operating system
The affected Apps Might not Open properly or may cause other issues which includes the possiblity of getting a Blue screen error
Here, the worst part is that the registry keys might be irreparable.
Though nothing much has been described in the Windows Health Dashboard Entry, Microsoft has clubbed the issue with the previous bug that restricts Cốc Cốc browser users to upgrade to Windows 11.
In case your organization is utilizing the Update Compliance, then the safeguard ID for devices with Cốc Cốc browser users is 35891494.
For the time being, Microsoft has blocked those Windows devices from upgrading to Windows 11.
Additionally, the affected Windows users are suggested not to temporarily stop manually upgrade to Windows 11(via Media Creation Tool or Update now button) until a fix is released.
Microsoft is further investigating the issue and looking to fix it with October Patch Tuesday.
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