If i have another PS3 with lower version firmware. Have anyone with firmware 1.54 or 1.60 made it to work?
besides i didn't need to go to the japanese PSN shop to download this i used ps3 proxy and use the URL link, download in background, and it works, i did the same with Gripshift, and Super Rub 'a' Dub works nicely without going into actual region of the store, and I don't have a Japanese account on my PS3. I used my US account

download through the download list on my account.