1. aman704's Avatar
    I'm using blackberry 9790. My phone was giving me problems from some days and it had an unofficial OS 7.1 bundle 840.
    I decided to downgrade the OS to the official 7.1 which was not out.
    I followed the stuff mentioned here http://crackberry.com/how-downgrade-...erating-system
    What I skipped was the first step since I had new windows installed in my computer so previous versions weren't installed. All went fine until I wiped the device. It shows the error 507 and I could not proceed as it was mentioned in the link.
    My apploader is stuck on this screen:

    and DM shows this screen:

    I have already installed the Official os which I downloaded in my computer. I had also deleted the vendor.xml file.

    Please help me! My device does not work anymore
    07-06-12 12:27 PM
  2. OniBerry's Avatar
    Error 507 means you have to reload your OS on the device, as it is no longer there.

    KB02792-BlackBerry smartphone displays Error message “507” when upgrading BlackBerry Device Software
    07-06-12 12:54 PM
  3. aman704's Avatar
    Which OS should I try?
    Nothing really happens when I install the lower edition of the official OR.
    07-06-12 12:57 PM
  4. DWPGQ's Avatar
    The next OS is always the best option..........the fact that you had problems with your last OS could mean that it was just a bad install.
    07-06-12 01:00 PM
  5. zocster's Avatar

    Remove all OS from pc, using add remove program.

    Delete all the os folders in shared directory

    Delete apploader folder

    Reboot PC

    Heard is out for a few carriers, so install that.

    Google vendelete and run it

    Run loader.exe
    07-06-12 01:03 PM
  6. g000se's Avatar
    Awesome advice - i consider myself to be BB savvy but this was doing my nut!!

    Thanks for the clear concise instructions
    08-07-12 06:25 AM