Wololo release today VHBL for PSVita with FW 1.67 and using the PSP Game Super Collapse 3. Vita Half-Byte Loader is a project to port the PSP homebrew loader HBL to the Playstation Vita, through the PSP emulator on the Playstation Vita.

How to Install and Run HBL on Super Collapse 3

It is *strongly* recommended that you turn of all wireless connections on your PS Vita, and that you use OpenCMA on your PC instead of the regular CMA. This is recommended because otherwise your console has a way to force you to upgrade the firmware even before you get a chance to use the exploit.
Extract the HBL archive matching your version of the game in your CMA PSP Savedata folder. It is a folder on your PC named PSSAVEDATA/[lots of random characters here]. If you don’t know where it is, check your settings in CMA
Connect your PS Vita to the PC through the CMA, it should give you the possibility to copy the savedata from your PC to the Vita. If not, you probably extracted it in the wrong folder. (Note: You will also want to install some homebrews with a similar technique, read the section below)
To run HBL, start the game, select “Continue” in the Main Menu. Load the VHBL savegame, then go to “High Scores”. At this point, VHBL should start

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Wololo met en ligne aujourd’hui une nouvelle version de VHBL, pour les PSvita en FW 1.67. Pour rappel Vita Half-Byte Loader est un portage du hombrew loader PSP HBL. Pour faire marcher cette nouvelle version vous aurez besoin du jeu Super Collapse 3.

How to Install and Run HBL on Super Collapse 3

It is *strongly* recommended that you turn of all wireless connections on your PS Vita, and that you use OpenCMA on your PC instead of the regular CMA. This is recommended because otherwise your console has a way to force you to upgrade the firmware even before you get a chance to use the exploit.
Extract the HBL archive matching your version of the game in your CMA PSP Savedata folder. It is a folder on your PC named PSSAVEDATA/[lots of random characters here]. If you don’t know where it is, check your settings in CMA
Connect your PS Vita to the PC through the CMA, it should give you the possibility to copy the savedata from your PC to the Vita. If not, you probably extracted it in the wrong folder. (Note: You will also want to install some homebrews with a similar technique, read the section below)
To run HBL, start the game, select “Continue” in the Main Menu. Load the VHBL savegame, then go to “High Scores”. At this point, VHBL should start

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Source : http://wololo.net/wagic/vhbl-for-super-collapse-3/