Lost all default tones on my Torch 9850/OS 7 the other day.
Fix action:
Utilizing BBSAK
Download and Install the current OS for your device model to your PC
Open BBSAK
Select Modify COD's tab.
Click Install COD
Browse to C:\Program Files (x86)\Common Files\Research In Motion\Shared\Loader Files\(current device latest OS folder)\Java
In the search bar type: ringtones
**The two files that should come up are net_rim_bb_medialoader_ringtones_480x800_01a_t.cod and net_rim_bb_medialoader_ringtones_480x800_01b_t***
Yes both files are named the same but they are two different sizes.
Double click one of the files and wait til BBSAK tells you "installed COD file successfully."
Repeat the steps and select the other file, then wait again for the completion message.
Once complete disconnect your device and open Ringtones and Alerts found in the Applications Menu. Wait for your device to re-read your SD Card and Device Memory. (See progress bar across the bottom of your screen).
Once that is complete if you don't see the individual categories populate exit and re-enter Ringtones and Alerts. I found 9 Ringtones, 9 Notifier Tones, 9 Reminder Tones, and 5 Alarm Tones. (These are the defaults for OS 7)
Walaa!!! Default Ringtones restored. (NO NEED TO WIPE YOUR DEVICE)
Hope this helps!!! Good night all, and happy Crackberrying!!!!