PSP umd region code

yes, try changing region to region 1 as it is possible the umd (disk you bought) is designed not to run unless the region matches. you'll probably have to change it again if you want to read disks from different regions.
my kids have the psps on their holidays at the moment back tomorrow, i will check the restore menus tomorrow for you and see if there is any other changes possibley needed,
also it is worth a try but try changing xmd to umd disk ( eventhough this is for access to memeory usually for usb connection, although it could be something to do with ver 3.71) note youl have to change it back to enter usb mode from your computer.
is yours the PSP slim version or standard version, ?