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Reference site…
http://daichimiyasaka.com/blackberry10-3-1-update-2911.html
https://github.com/xsacha/Sachesi/releases
Step to use Sachesi
1. Open Sachesi
2. Click the search tab
3. Set your career, country, and your BB model.
4. Click download on the bottom right.
5. Wait to complete the download.
6. Click the install tab.
7. Click the install folder on the right top conner.
8. Choose downloaded folder with want-update version of BBOS.
9. Click install… and wait.
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