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BlackBerry® Curve™

New Contributor
Posts: 3
Registered: ‎11-05-2011
My Device: Blackberry Curve 8520

Blackberry Curve 8520 OS 5 - Error 507

I am getting the Error 507 - Unable to load OS . I need to install the OS 5 on the device. Can anyone provide me  the link or the file for the same. My provider is Airtel - India. I have BBSAK installed and I plan to load the OS through that once I have downloaded it.


  • I have tried updating software through the Update option on the official blackberry site - Failed
  • And the device doesnt even read Blackberry Desktop manager.

Please if anyone could help me download the OS 5.



Thanks & Regards

Anthony Francis

Posts: 87,231
Likes: 23,319
Solutions: 6,027
Registered: ‎04-01-2008
My Device: Passport • Z30 • Z10 • Torch9850 • Playbook
My Carrier: Verizon

Re: Blackberry Curve 8520 OS 5 - Error 507

Yep, can help, this is answered here in the forum many many times.

You can use BBSAK if you want, but if you want instructions using BBSAK, you're better off asking BBSAK.


See the link below for the download, and follow these simple installation instructions.

First locate your carrier and the OS file you wish to use.

1. Download the OS file to the PC then install it to the PC by running (double clicking) the file you downloaded.
2. Go to c:\program files\common files\research in motion\apploader and delete the file named "vendor.xml."
3. Plug in BB and double click on "Loader.exe." It's located in the same place as the above vendor.xml file.

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New Contributor
Posts: 3
Registered: ‎11-05-2011
My Device: Blackberry Curve 8520

Re: Blackberry Curve 8520 OS 5 - Error 507

Thanx shall try that at home today, I have downloaded the OS too. Hope it works, shall post back =)