POC: Permanent CFW/HEN is Possible
In a recent experiment kgsws set out to find permanence for CFW installs… And the result: success! Winning like Chuck Sheen, kgsws has shared a proof-of-concept; however, I’d only attempt this on a FAT PSP-1000 handheld until further notice.
- install OFW 6.20
- use HEN to run PSP filer
- obtain original lfatfs.prx
- decrypt original lfatfs.prx, also get kirk header for later fake encryption
- compile fake lfatfs.prx (attached below)
- append zeros to fake lfatfs.prx to make it as big as original, uncompressed lfatfs.prx
- gzip fake lfatfs.prx, it has to be at least 16 bytes smaller than original lfatfs.prx gzipped
- use any fake encrypter to encrypt your fake lfatfs.prx, keep original lfatfs.prx ~PSP hader and kirk header
- copy fake lfatfs.prx to flash0:/kd/, overwrite original
- restart your PSP and watch
Again: PSP-1000 only … because kgsws has written IPL drivers specific to the TA-079 board, most commonly found in PSP-1000 models. It’s a safe bet this’ll lead to other models being hacked the same way. So unless you really know what you’re doing I wouldn’t test this on anything else.
- you must append zeros to make it as big as original
- you must gzip it
- you must use original lfatfs.prx ~PSP and kirk headers
- every PRX in flash contains signcheck = your PRX is bound to your PSP
- this won’t allow you to enter OFW anymore, you will have to use pandora to flash it again
- this trick will likely work on new PSPs, but this small LCD driver not, and your PSP will become useless anyway (so wait for CFW)
kgsws’ idea for custom firmware: “Use fake lfatfs.prx as CFW “SystemControl” module, and instead only patching also load original lfatfs.prx (which will be renamed).”
Awwwesome! Cheers to kgsws with thanks to Boosters IPL SDK.
Download: fake lfatfs.prx (source code)
Topic: POC: Permanent CFW/HEN is Possible
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