Half Byte Loader (a.k.a HBL, a.k.a the Valentine Project) is a tool that allows to run unsigned code and games on the sony PSP.
Wololo today posted a new video of HBL in action. This time PSV runs Doom and does it well. Wololo also gave us some more info on the HBL itself :
“We are aware that this hack will be easily patched by Sony, but we still plan to publicly release it some time soon after the US/EU release of the Vita (we still have to port HBL to the EU/US versions of the game but that shouldn’t have any difficulty).”
So we’ ll get a HBL sometime after the US/EU release but as expected it’s easy patchable.