| | 06-14-2011, 02:38 AM Thread Author #1
Success: Downgrading an OS using Mac + DM
As we know, even though DM for Mac gives you an option to downgrade an OS, I continue to get the error and the install never completes. After about a week of playing around I was able to downgrade my BlackBerry 9700 from OS 22.214.171.1244 to 126.96.36.1992. These are both official carrier releases from Bell Mobility.
I was able to do this using only OSX 10.6.7 and DM for Mac v2.0.1, No Bootcamp or Windows required.
Here is a step by step how I did it
1.) Plug your Blackberry into the Mac and open DM. While still running on OS6 back up your device!
2.) Eject your Blackberry from DM and disconnect the USB cable.
3.) Remove the battery from your device
4.) Attach USB cable to device, wait for a pop up screen to appear on DM
5.) When the "Unable to connect to device" screen appears, click on the update button.
6.) A list will appear after a moment with all of your carrier official OS's. Select the one you wish to downgrade to. I selected 188.8.131.522, the latest OS5 supported by my carrier. Click Install.
7.) DM will begin downloading the OS and install on your device. When it reaches the "Waiting for device to initialize" screen, wait for your Blackberry to display a screen showing the battery missing icon. At this point place the battery back in your device and wait for it to reload.
8.) Once the device has booted up, DM will install the remaining applications and once more reboot your Blackberry.
9.) Upon completion of the reboot, OS5 is installed and the Blackberry is ready to use.
10.) Using DM restore your device.
I have duplicated this twice now on my 9700 and it has worked both times without using anything but OSX 10.6.7 and DM.