From the read my file:
-- Installing custom firmware 1.62 increasing edition --
For install custom firmware, copy the PSP folder in the root of your memory stick. Then, execute the flasher and press X.
Later custom firmware will be installed.
But there is 3 files in the XMB:
IEFlasher KXPloit boot by PSP-DEV Team
I dont want to gess so can anyone help me?