“wololo, m0skit0, ab5000 and JJS have released the latest build of the HalfByte loader for the PSP 1k through PSP Go! that now works on…. wait for it…. 6.31!!
Yeah, you can now use one of the newer exploits in Minna no Golf Portable. It is called something different in every region: Everybody’s Golf (EU), Hot Shots Golf Open Tee (US), or Minna no golf Portable (JP).” -crait

It is now working for all regions but for the EU regions, use this method to get it to work:
1) Rename the folder hbl/libs_6xx to hbl/libs .
2) Rename the file hbl/config/imports.config_6xx into hbl/config/imports.config .

US Download – EU Download – JP Download
Source: wololo
Discussion: Here