Okay, did that, (although it did through up a couple of errors about not being able to download some parts..) and it seems to have given me the new version, but I can't set the rom directory or the bios directory..

I'm given the two options, and I can go in and select them, but they don't seem to be saved, as if I tap the blurred area to get out of that menu, no games appear, and if I press either of the menus again, I'm back at the root directory...

Recently, my phone name had a '$' character added to the front of it I believe when my storage ran out whilst recording a phone call, could this be something to do with it? (It didn't affect the previous install of psx4m, however...)