Reload software blackberry error 507 normally occurs when you do not have an operating system installed.The blackberry error 507 May sometimes appear on boot loader or a white screen as shown below .These problems are among the Blackberry app error 200 reset .If you owned a torch 9860, then this problem “blackberry error 507” is dominant among these series. Also, another reason you are seeing blackberry error 507 messages .It can be a cause of an incorrect or corrupted software update. How To Fix Blackberry Error 507 Messages for some people connecting to your computer and updating via blackberry desktop manager may work but few have this problem“application loader was unable to connect to your device, please re-connect to your device,entire the password, if required, and click retry“ Backup all data The simplest and most helpful way to fix blackberry error 507 is to > Download BSAK 1.9 : http://www.bbsak.org/ > Download BBlackBerry Desktop Manager As I said above its an operating system not found a problem, therefore, you will need to download a newOperating system from here chooses your device. > Installed both BSAK and Blackberry desktop manager >Click BSAk and wipe the device, your device will reboot >Install the .exe files >To install the new operating system, navigate to -to crogram files common files research in motion app loader and delete the file named “vendor.xml.” > Now you can Plug your Blackberry using USB and double-click on “Loader.exe.” you can find it in the same place as the above vendor.xml file. you receive a confirmation message stated that the update now completed, At this point, this point remove the USB from the Computer > Open blackberry manager, click restore, search for your backup file and restores your phone.