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

Downgrade Method - Emulating JIG with Linux

1st step – Generating a challenge

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1. ps3dm_usb_dongle_auth /dev/ps3dmproxy gen_challenge

2nd step – Generating a valid response for a challenge

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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 !!!

1. 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”)

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1. 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

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The returned value shouldn’t be 0xff.

1. ps3dm_um /dev/ps3dmproxy read_eprom 0x48C07

5th step - Inspect if CORE_OS_PACKAGE.pkg isn't damaged

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ps3dm_um /dev/ps3dmproxy inspect_pkg 1 0x9 CORE_OS_PACKAGE.pkg

6th step - Install CORE_OS_PACKAGE.pkg

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ps3dm_um /dev/ps3dmproxy update_pkg 1 0x9 CORE_OS_PACKAGE.pkg

7th step – Disabling “Product Mode”

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1. 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

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1. ps3dm_um /dev/ps3dmproxy write_eprom 0x48C07 0xfe

2th step – Checking if “Product Mode” is enabled

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The returned value shouldn’t be 0xff.

1. ps3dm_um /dev/ps3dmproxy read_eprom 0x48C07

3th step - Inspect if CORE_OS_PACKAGE.pkg isn´t damaged

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ps3dm_um /dev/ps3dmproxy inspect_pkg 1 0x9 CORE_OS_PACKAGE.pkg

4th step - Install CORE_OS_PACKAGE.pkg

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ps3dm_um /dev/ps3dmproxy update_pkg 1 0x9 CORE_OS_PACKAGE.pkg

5th step – Disabling “Product Mode”

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1. 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