I have the same problem, but am not technically astute, at ALL, when it comes to messin' with root files. I'm in deep yogurt....
I paid to get my website moved to an upgraded platform on the same host and the technician "mover" got my main website moved, including my phpBB forums. BUT, the forums that mover technician has in place now has lots of headers and just a few posts, but almost all of my thousands of threads are gone! This is VERY bad because almost ALL of the threads were very technical high performance automobile info and pictures! Heck, I could have screwed up the move like this myself, for FREE!
In any event, I have located the old files for my phpBB, on the old server, in fact I'm looking at them in phpMyAdmin right now! All I need right now is just some help making sure that I get a total and complete backup, downloaded to my own computer, so this "technician" doesn't lose all my irreplaceable files.
ANY help is really appreciated guys... Thanks a million in advance!!!