i dont know if the info is already known, but i think the guy updated his info:
1 - Install TB ELF Dumper first as stated in its readme file.
2 - Start Multiman, it will make a dump of multiman eboots, so you must delete it first by browsing to dev_hdd0 then delete all DUMPEDEBOOT.BIN files you found there.
3 - Back to multiman game selection then select any TB game then launch it.
4 - Start the game from XMB then wait for some times until game start.
5 - Exit game now then start multiman again then browse to dev_hdd0 and now you must found a decrypted game dump.