PSP ModeでPSP向けHomebrewアプリを起動できるPlayStationVita向けHomebrew Loader
「Vita Half Byte Loader Rev137 for みんなのテニス ポータブル」がリリースされました。

How to install/run on the Vita
0) This version of HBL relies on an exploit in the Game Minna no Tennis (みんなのテニスR ポータブル).
In order to run HBL you need to own a legit copy of this game on your PS Vita.
At the time of this writing, the game is not patched but it goes without saying that HBL comes with no guarantee. Buying this game is your own decision and I take no responsibility if HBL ends up not working on your machine

1) Once you have a copy of the game, 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.
OpenCMA can be downloaded at

2) Extract this HBL archive 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

3) 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)

4) To run HBL, start the Minna no Tennis (みんなのテニスR ポータブル) game, and simply press O in the first menu : HBL should start.