I was deleting the conversations on my bb messenger and by mistake. Is there a way I can retrieve them? I tried looking for a deleted folder but I cant find them!
Google Sync can be automatic, or manual, it all depends on how you set it up. So if you don't know, that worries me.
So these were BBM contacts you deleted? have you done a backup within BBM lately? That could get them back. And no, there is no delete folder, that is why you always keep a current backup in DM for when accidents happen.
If you backed up your BBM list within BBM, then it either saved it to your memory card or to your email address. So you had "all of that" what does that mean? When you upgraded did you transfer any of your contacts? What kind of contacts did you lose, BBM or normal contacts? If you deleted a contact from your address book, then your most likely SOL. But, if you deleted one from BBM then there might be some hope. We need some more information from you though...
Did you ever do a backup from within BBM? Like going to BBM> BB Button> Options> then backup and restore functions there. If not then your SOL, if so, do a restore.