prometheus 4..Will installing it on my PSP mess up my memory?

Still using 5.50 GEN D Full on PSP 1000 series. Jak and Daxter Lost Frontier still not working. If I NOW install Prometheus 4 will that in any way mess up my memory card? I just had to reformat it after trying to play a Bomberman Land and I dont want to go through that again...lol So, adding Prometheus should be just as simple as downloading it then adding it to my memory card? Thanks.HoustonTX224

It shouldn't mess up your memory card. Backup your SAVEDATA folder though, as the update can corrupt your saves.

Alternatively, try patching the game using ISO Tools. That should enable you to play any games on your current firmware.