Psp Usermode Tutorial

[grief3r]

how can i hex edit an iso so that it loads the opcode i want for an address

for example if an instruction was beq,what do i need to do to make it load bne instead without the need of a cheat device?

Extract EBOOT.BIN from disc0:/PSP_GAME/SYSDIR/.
Decrypt EBOOT.BIN, look for the instruction that you want to modify, modify it and save the file. Use UMDGen to replace EBOOT.BIN with your modified one and save as an ISO.

i wanna jump to my own subroutine but there's no nop caves anywhere, do i have to insert bytes in order to do so?, or will the game crash if i insert any bytes

or do i simply insert zeroes in the boot.bin?

also how to i encrypt the eboot? prx decrypter only has the option to decrypt

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