Make sure you have the main game's PARAM.sfo set to 3.40 and the updated folder as well on hdd0\games\BLES010032. Then make sure that you edited the metadata_db_hdd to 3.41 using a HEX editor. Last but not least, you need to play with BD inserted.
I had the same issue after I finished the editing. Played teh game and I get black screen until I used a BD. Now everything is working fine; although I can't understand spanish. Hope this helps.