I'm guessing it's urgent
I don't have a huge amount of time, but I'd be happy to take a copy of your backup file (if you granted my
ftp access to the file) and restore it and see if I can get a phpBB frontend talking to it.
I'm a bit busy now, but could probably squeeze you in later this evening (about 22:00 ish UK time).
I have MySQL certification, so if the issue is database related, I can probably solve it.