Hatsune Miku: Project DIVA F 2nd [NPJB00435]

Today i reconfirm install process.
First. Ingame install process check "data.psarc" file at "hdd0/game/NPJB00435_CACHE/USRDIR/install" folder and if file exist in there then make dummy.bin file.
This process don't change "data.psarc" file.

Second. Using modified file process is also checking "data.psarc" file at "hdd0/game/NPJB00435_CACHE/USRDIR/install" folder.
Also file exist in there installer copy "data.psars" file(but i don't know which folder's file.) and overwrite it to cache folder then also make dummy.bin.

In conclusion
1. install process's success condition is data.psarc's direction maybe...
2. install process's activity is only copy and paste. and make dummy.bin.
3. install process's success is not important. It don't changes any situation. Orz.