I couldn't get the wiitdb.zip file to rename the titles, when I connected my external HDD to a friend Wii (3.3E, no modchip, cios10).
I don't think it's wii's version releated, nor TV format (I tried both 16:9 and 4:3, on loader option and on wii preferences).
I tried r713, and some older revisions (648M, 670, 688, 707) with database path from usb & SD, I tried different wiitdb.zip files I had (a short one with only the available games, and a complete xml).
I don't have a title.txt, and I activated the title from xml option in the gui.
I know this is not helping, but I just wished to say it.
It's just strange it's working on my Wii and not on my friend's.
(My wii is 3.2E, wiikey1, cIOS10)