The only real difference in my opinion between the 9700 and the 9780 is the available app memory on each of the phones. Wit the 9780, you have 512 MB so even after you install the OS, no matter how many apps you have on, you will never run out of memory. But with the 9700 you are limited to 256 MB and thus, if you shrink your OS (remove unnecessary components) you improve the performance of your phone drastically and prevent low memory errors especially while browsing.
Follow the below guide and watch how your phone will perform differently!
1) Ensure that you do not have any previous OS installed on your PC by going to Control Panel and uninstalling any BlackBerry Device Software that you see there. (AGAIN, DEVICE SOFTWARE, Not BlackBerry Desktop Software, DEVICE!!)
2) Install the Operating System which you have downloaded on your computer.
3) Navigate to C:\Program Files (x86)\Common Files\Research In Motion\Shared\Loader Files and ensure that folder is empty, if there was any folder in there (usually any previous OS files will be there), then delete it, that folder needs to be empty before we start.
4) Download and install OS 6, you may choose any build you want.
5) Download and install BB Boss v2.2.2
6) After selecting all the components / languages you want to, click on the Add/Remove button on the bottom right to initialize the shrinking process, when it is over, you will see at the bottom right by how much was your OS shrunk (in MB)
DO NOT REMOVE ANY LANGUAGE FILES UNLESS YOU DONT NEED THEM, ENGLISH UK CAN SAFELY BE REMOVED IF YOU DON'T USE IT AS ENGLISH USA WILL ALWAYS BE THERE BY DEFAULT.
The below image are the options that I select to be removed, feel free to change anything according to your requirements. Make sure the OS Build Folder has the right directory path of your OS and not blank like the image below.
7) Navigate to:
Computer >>> C: >>> Program Files >>> CommonFiles >>> Research in Motion >>> Apploader
Computer >>> C>> Program Files (x86) >>> Common Files >>>Research in Motion >>> Apploader
Then delete the file named vendor.xml (only if it was there, if it wasn’t then don’t bother)
8) Run apploader.exe within that same folder to start the OS update.
9) While getting the options of components to install, you should now see much less as you have shrunk your OS, however, still do a final check to ensure that everything that is checked is something you actually use. Sometimes for example, the Chinese language or any other language or component might be there, so just don’t select it if you don’t want it.
I would personally not bother with Social Feeds as well as it is of no use tome, saves me some space not to have it. (This is a personal choice, if you need it, then keep it)
What Social Feeds does is it interlinks all your social apps such as Facebook and BBM, twitter, etc, into one application, so for example if you want to set your status as gone on holidays, you don't need to do it on each application separately, social feeds will do it for all in one step. Still, I personally don’t need that.
Next come podcasts, if you don't deselect that during the installation it automatically gets installed, again, useless to me. TuneIn radio is much better IMO.