Backup contact list
Although the list of contacts in BlackBerry Messenger (BBM) You must not lose, make it more secure, backup your contacts list first before running the installation. If you happen to lose, then you can still return it to restore files backed up.

Consider the setup options
What often happens after the installation is the loss of fuel on the BlackBerry icon. This is because the user did not choose the setup application v5.0 fuel in accordance with the type of instruments. For example, the device setup install fuel Bold Curve version.

For those of you who already lost contact after an upgrade to fuel oil due to failure v5.0 download (downloading failed), the following tips that may help:

1. Once known to have notification ‘Download Failed’ do not rush to restart your BlackBerry. Connect immediately via PC or laptop, and entered the Blackberry Desktop Manager application.

2. After your BlackBerry PIN code readability, search Backup menu, and then backup data your Blackberry including important contacts. Wait until the exit message ‘Successful’.

3. After the backup data, back to Blackberry Desktop Manager. Please repeat the download fuel until 5 in the Blackberry successful. And, do not restart your BlackBerry before it successfully if you do not want to lose contact.

4. After a successful, make sure your fuel contacts are still there or not, If it is gone, reconnect your Blackberry to your PC / or laptop.

5. Run BlackBerry Desktop Manager application. After the PIN code on your BlackBerry Desktop Manager reads, immediately to the Restore menu.

6. Look for the backup file name you have saved reply earlier, then open the file. Then click OK, then click OK or Restrore. Wait until finished. After that, your contacts will return as before.