First of all, be sure you updated extinfo.dat, infolib.dat, savlib.dat NOT ONLY ttpatch.dat!
-> Download this package to edit '/TTMENU/extinfo.dat' and '/TTMENU/infolib.dat' related to the ID games database (on your Micro SD card).
-> Use ttd.exe and open both .dat files we were talking above; find the lines with the BH2P code of your game.
-> In both .dat, you got to copy the original code line relative to your game and then rename it (Data Control -> ID info...) : you should got another line in both files BH2P - 846984F8 and BH2P - 16488857
Exemple with Pokemon B/W : !!! The hex data should not change as you just do copies, then only edit the ID you see in the main window, left column !!!
-> Save the files where they were on the card (/TTMENU/).