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1. #Xbox 360 keyvault checker update#
2. #Xbox 360 keyvault checker Patch#
3. #Xbox 360 keyvault checker code#

The LDV (fuse count) will be corrected for CB (which is why you need to find a new hash) and the hash value is set to all zeroes.Īn external 1888 base kernel is needed because essential system files for 1888 is overwritten in the 4552 update and later, making it impossible to use the NAND dump to create a new 1888 image.

#Xbox 360 keyvault checker Patch#

Get a plain 1888 base kernel and patch the CB lockdown counter with the LDV (LockDownValue) from the CF section in the NAND dump. Use Infectus or custom hardware (memorycard reader) to make a valid dump of the current NAND. The official documentation by robinsod for the downgrader hardware and downgrading process can be downloaded from the Timing Attack thread over at XboxHacker. Statistically only half has to be tried, 2048 tries. Possibilities: 16 bytes * 256 different possibility for each byte, total 4096 tries. The time differences for a valid and false value is about 2200 microseconds. Measuring each byte will in the end reveal the correct hash and the boot process can continue. By changing one byte at a time it's possible to determine if a byte is the valid (true) by measuring the time to compare a false and a true value.

The value is 16-bytes long and is done byte-by-byte wise. This means to be able to run homebrew or linux we now have to start theĪ memcmp function is used to check the CB-auth HMAC-hash value. After running the exploit we have completeĬontrol over the xbox (but not before that). Run these (old) kernels and exploit them by running a patched KK game. And when we have our cpu key we can choose to But we cannot make changesīecause two kernel versions MS build (4532,4548) have a tiny flaw. The only thing weĬan do with the cpu key is choose which version of the kernel/bootloader we want to run. Than what MS has build (like the kernel and bootloaders). This is what prevents us from running anything different Why we will never be able to sign our own executable code.

#Xbox 360 keyvault checker code#

Can we not resign the essential parts of the HV, or anything else, with a modified bootloader?Īll executable code on the xbox is (one way or another) signed by a RSA key.