Editing KaKaRoTo Kind of ´Jailbreak´
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<div style="border-width: 1px; border-style:dashed; border-color:#000000; padding: 10px; background-color:#FFFFFF; color:#000000; ">Since the LV0 keys have now been leaked, I believe I can now share this info with you, to help out those who are trying to build their own 4.x CFW : | <div style="border-width: 1px; border-style:dashed; border-color:#000000; padding: 10px; background-color:#FFFFFF; color:#000000; ">Since the LV0 keys have now been leaked, I believe I can now share this info with you, to help out those who are trying to build their own 4.x CFW : | ||
The NPDRM ECDSA signature in the SELF footer is checked by lv2. It first asks appldr to tell it whether or not the signature is to be checked, and appldr will only set the flag if the SELF is a NPDRM with key revision from 3.56+ (the ones without private keys). This means that the SELF files signed with the new 3.56+ keys still don't have their ecdsa checked (probably to speed up file loading). | The NPDRM ECDSA signature in the SELF footer is checked by lv2. It first asks appldr to tell it whether or not the signature is to be checked, and appldr will only set the flag if the SELF is a NPDRM with key revision from 3.56+ (the ones without private keys). This means that the SELF files signed with the new 3.56+ keys still don't have their ecdsa checked (probably to speed up file loading). | ||
If appldr says the ecdsa signature must be checked, then lv2 will verify it itself, and return an error if it's not correct.< | If appldr says the ecdsa signature must be checked, then lv2 will verify it itself, and return an error if it's not correct. There are many ways to patch this check out. | ||
1 - Patch out the check for the key revision in appldr | |||
2 - Patch out the "set flag to 1" in appldr if the key revision is < 0xB | |||
3 - Patch out the code in lv2 that stores the result from appldr | |||
4 - Patch out the actual sigcheck function from lv2. | |||
5 - Ignore the result of the ecdsa from lv2. | |||
Here is one of the patches (the 4th one, patching out the check function from lv2) : | |||
In memory 0x800000000005A2A8, which corresponds to offset 0x6a2a8 in lv2_kernel.elf, replace : | |||
Here is one of the patches (the 4th one, patching out the check function from lv2) : | |||
In memory 0x800000000005A2A8, which corresponds to offset 0x6a2a8 in lv2_kernel.elf, replace : | |||
e9 22 99 90 7c 08 02 a6 | e9 22 99 90 7c 08 02 a6 | ||
With : | With : |