a ps vita with VHBL or ecfw
ftp or file manager app on your vita
Rename your GAME directory to GAMEX by ftp or your file manager.
Then rename the directory which belongs to the psp game/mini you want to clone in PSP/GAMEX/. For example rename NPEZ00176 to NPEZ001X1. After that rename GAMEX back to GAME. Then backup the game which you renamed via CMA.
Repeat the process again, this time renaming NPEZ001X1 to NPEZ0001X2 and again backup it via CMA.
You can then transfer your newly made backups back to your ps vita and repeat this process aslong as Vita reaches maximum number of bubbles.
Enjoy your new bubbles and have fun.
WARNING: It is recommended to backup your exploit game to your pc (or make a backup of your memory card). Also it is better if you try this on a fresh memory card.
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