The game used for Neur0n’s VHBL port is Monster Hunter Freedom Unite, also known as Monster Hunter Portable 2ndG in Japan. Similar vulnerabilities exist in Monster Hunter Freedom 2 and in Monster hunter Portable 3rd, for which we also have VHBL ports (although I haven’t personally tested these ones).
Once you have downloaded and installed the game, it is recommended that you do not update your console. In particular, do not update the CMA client. The VHBL files will be released, as usual, after the game gets pulled from the store.