Downgrading with linux
You should have grafchokolos modules, and patches installed
This works on 3.55 without a physical dongle
Use this method to install lower firmware! You can install a newer firmware ex 3.60 with this method but you will be loosing your homebrew
Thanks to graf_chokolo for bringing linux, with all this goodies back to the PS3
Downgrade Method - Emulating JIG with Linux
1st step – Generating a challenge
- ps3dm_usb_dongle_auth /dev/ps3dmproxy gen_challenge
2nd step – Generating a valid response for a challenge
You need a dongle id. Valid range for dongle IDs is 0×0000 – 0xffff. So choose one, doesn’t matter which one, but some are revoked !!!
- ps3dm_usb_dongle_auth /dev/ps3dmproxy gen_resp 0xBABE “here is a challenge like this 0xXX 0xXX … of size 20 bytes”
3rd step – Verifying response (Enabling “Product Mode”)
- ps3dm_usb_dongle_auth /dev/ps3dmproxy verify_resp 0xBABE
“here is the response from step 2 like this 0xXX 0xXX … of size 20 bytes”
4th step – Checking if “Product Mode” is enabled
The returned value shouldn’t be 0xff.
- ps3dm_um /dev/ps3dmproxy read_eprom 0x48C07
5th step - Inspect if CORE_OS_PACKAGE.pkg isn't damaged
ps3dm_um /dev/ps3dmproxy inspect_pkg 1 0x9 CORE_OS_PACKAGE.pkg
6th step - Install CORE_OS_PACKAGE.pkg
ps3dm_um /dev/ps3dmproxy update_pkg 1 0x9 CORE_OS_PACKAGE.pkg
7th step – Disabling “Product Mode”
- ps3dm_um /dev/ps3dmproxy write_eprom 0x48C07 0xff
This step is really important, if Product Mode isn't disabled you will need a dongle to get out of it
ALTERNATIVE METHOD - not tested
1st step – Enabling product mode
- ps3dm_um /dev/ps3dmproxy write_eprom 0x48C07 0xfe
2th step – Checking if “Product Mode” is enabled
The returned value shouldn’t be 0xff.
- ps3dm_um /dev/ps3dmproxy read_eprom 0x48C07
3th step - Inspect if CORE_OS_PACKAGE.pkg isn´t damaged
ps3dm_um /dev/ps3dmproxy inspect_pkg 1 0x9 CORE_OS_PACKAGE.pkg
4th step - Install CORE_OS_PACKAGE.pkg
ps3dm_um /dev/ps3dmproxy update_pkg 1 0x9 CORE_OS_PACKAGE.pkg
5th step – Disabling “Product Mode”
- ps3dm_um /dev/ps3dmproxy write_eprom 0x48C07 0xff
This step is really important, if Product Mode isn´t disabled you will need a dongle to get out of it
Install debug firmware
High brick risk! Don´t try this if you don´t know what you are doing If you brick with this the only way to recover is with a nor flasher and a proper backup
To install debug firmware, EID0 should be reencrypted and rehashed with the proper target and device ids/type
Debugging Station Target ID: 0x82
eEID contains
- system model data
- target ID
- PS3 motherboard revision
- Per ps3 values (console id, psid...)
Other target IDs (might be helpful if someone messes this up)
Targets IDs
- A0 = system debugger
- 81 = reference tool
- 82 = debugging station
- 83 = japan
- 84 = USA
- 85 = Europe
- 86 = Korea
- 87 = UK
- 88 = Mexico
- 89 = Australia/New Zealand
- 8A = South Asia (Asia except China, Japan and Taiwan),
- 8B = Taiwan
- 8C = Russia
- 8D = China
"The kernel and most of the loaders check the target id as well as the device id/type to see if your unit is debug or not and if not they disable all the fancy things such as running unsigned code (in the case of appldr).
- a good read about SC http://rms.grafchokolo.com/?p=16