While a "traditional" English patch for the original Japanese PSP ISOs remains elusive, fans have two major modern alternatives that achieve the same goal:
Legal and ethical considerations Fan translations exist in a legally gray area. Key points: Umineko No Naku Koro Ni Psp English Patch
For those interested in learning more about Umineko No Naku Koro Ni and the PSP English patch, here are some additional resources: While a "traditional" English patch for the original