you gonna need to MSINSt the memory card again..
heres what you need to do:
*your memory should have a msipl.bin in the root of it..
*now you need to get a hold of the msinst tools ( check my SIG )
*extract the tools in the desktop and copy the folder called MSINST
*now you need to place that msinst folder in the root of C: drive
*just to make sure that you have the proper file in that folder
*dbl click on it and you should have MSINST.exe and MSIPL.bin
*if you have both of those file in there, then continue on..
*enable USB mode on your psp
*note the drive letter of your psp
*open cmd window
*type the following command " CD C:\ " No quotation
*after that now
*type the following command " msinst\msinst.exe X msinst\msipl.bin " where X is the drive letter of your psp No quotation
*it should give you the MS BOOT WRITEN or something like that.