S5L8920

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This is the processor used in the iPhone 3GS.

S5L8920 using THUMB-2 instruction set as much as ARM and THUMB ones. So the binaries compiled for only Armv7 are not compatible with older CPUs.

Exploits

iBoot / Kernel

Bootrom

Userland

Boot Chain

Bootrom->LLB->iBoot->Kernel->System Software

See also

External Links