To resolve this issue, install update rollup 2955164, or install the hotfix that is described in this article.
Update information
For more information about how to obtain this update rollup package, click the following article number to view the article in the Microsoft Knowledge Base:
2955164 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update rollup: May 2014
Hotfix information
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.
If the hotfix is available for download, there is a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix Download Available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.Prerequisites
To apply this hotfix, you must first install the update 2919355 on Windows RT 8.1 or Windows 8.1. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
2919355 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update April, 2014
Registry information
To use the hotfix in this package, you do not have to make any changes to the registry.
Restart requirement
You must restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace a previously released hotfix.
File information
The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows RT 8.1 and Windows 8.1 file information and notes
- The files that apply to a specific product, milestone (RTM,SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:
| Version | Product | Milestone | Service branch |
|---|
| 6.3.960 0.17xxx | Windows RT 8.1 and Windows 8.1 | RTM | GDR |
- GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
- The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows RT 8.1 and Winodws 8.1" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 8.1
| File name | File version | File size | Date | Time | Platform |
|---|
| Bthport.sys | 6.3.9600.17903 | 992 KB | 10-Apr-2014 | 10:29 PM | x86 |
For all supported x64-based versions of Windows 8.1
| File name | File version | File size | Date | Time | Platform |
|---|
| Bthport.sys | 6.3.9600.17093 | 1,200,128 | 11-Apr-2014 | 06:13 | x64 |
For Windows RT 8.1
| File name | File version | File size | Date | Time | Platform |
|---|
| Bthport.sys | 6.3.9600.17093 | 946,176 | 11-Apr-2014 | 03:29 | Not applicable |