I'm pretty sure getting an 80029654 error means the data is corrupted. Don't quote me, as I'm only thinking back in time, but you might have to delete your Borderlands 2 file and start over
the game data right? not the save files?
i'll give this a shot, i just gave my ps3 a quick clean, and i'm trying to see if the update will install this time...
If your data is corrupted, it'll probably just be the game data you need to reinstall. I doubt your actual save file is what's causing it, but there might be a possibility that needs to be wiped too. Hopefully not though