There are a number of issues which can occur during the sync of BlackBerry contacts, calendars and memos to the PC via the BlackBerry Desktop Software.
Common BlackBerry Desktop Software sync problems include:
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ERROR (5211): There is an error converting Unicode string to or from code page string
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Synchronization Error – Error while reading field value
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Synchronization Error – Error opening data store accessor object
Steps to fix BlackBerry Desktop Software issues
All of the above problems are known to occur with BlackBerry Desktop Software v7.0 and in some cases v7.1. Therefore, we advise that you downgrade to version 6.1 of the software which is NOT known to cause issues. For convenience, below we included a link to the BlackBerry Desktop Software v6.1 as it is no longer available from BlackBerry’s website.
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Uninstall the existing version of BlackBerry Desktop Software from your computer. To do so, go to Windows Start menu, in the search box type “uninstall a program”, then hit the “Enter” key
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From the newly-opened window which lists all the installed programs, type “blackberry” in the search box. Select the “BlackBerry Desktop Software” and click “Uninstall/Change”
NOTE: To get to the above window on Windows XP, click Start, click Control Panel, and then double-click “Add or Remove Programs”
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Follow through the uninstall wizard to completely uninstall the Desktop Software
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Download v6.1 of the software from the link below
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Install the Blackberry Desktop Software to your PC. Start by double-clicking on the EXE file that you just downloaded and follow through the installation procedure
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Stand-by until installation completes. Finally, check the box next to “Start BlackBerry Desktop Software…” and click “Finish”
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The BlackBerry Desktop Software starts. You can continue the transfer of your BlackBerry data to the PC as the sync problems should now be resolved