Restoring BBM Chat History
I just had the same problem, and agree, although it was previously "discussed here" on another thread, that thread did not provide a solution. :|
I just had to do a clean reinstall of my Device Software and also lost all of my open BBM chat history. I finally figured out how to get it back.
Please note though, that this will OVERWRITE your new BBM chats since your last backup. So, if you have chat history since you updated your device software, you will lose the most current chats in favour of getting the rest of your history back from before your update (if that makes sense) ... So, I would recommend if you need the current/new chats, you'll have to email your current chats to yourself, or copy and paste them to a document. At least you'll have them for reference, if not in your chat history. I think you will also lose any NEW contacts you added since you restored, so make a note of them, and re-add them, after you've done the following:
Here's how I did it:
Open your BBM, go to the menu via the BB button, then choose OPTIONS.
Scroll down "Back up Management", click on "Restore" beside the "Restore a Backup of Your Contact List:".
Then, pick "Restore using a backup file from media card" (if you used your media card to back up). Other options are "... from device", and "... using email". I don't know how to restore using email.
This should bring you to a list of backup files saved on your device or media card.
Scroll down and pick the most recent back up file (the date you backed up prior to the device software update). File name should be something like "BBM-(12-01-16-10-54).bak"
It will prompt "The contact list will be replaced with the backup data, do you wish to proceed." If yes, click yes.
Go back to BBM... you should now have your open chats restored. As well, you can open a contact's old chat history, by opening the contact, click the BB button to bring up the menu, then choose "View Chat History", and that will bring up older chats.
It may take a few minutes to fully update, and you may have to update your profile pick again if it's changed since that backup.
Just remember the next time you have to do a clean reinstall or OS update, do this restore step right after the update, so you don't lose any current chats or contacts due to the restore.
Hope that helps! I was happy to get my open chats back... Oh, it should restore your group chats, too (I think).
Torch 9800 / 6.0 Bundle 1907