This is a fascinating and highly specific hardware hacking combination. The post you’re referring to likely discusses using an (often an Uno or Leonardo with ATmega16U2) in conjunction with Checkm8 —the permanent bootrom exploit for certain Apple devices (iPhone 4S through iPhone X)—to achieve something “exclusive,” probably bypassing some software restriction.
The combination represents a specialized niche in the iOS security world, specifically designed to exploit older Apple hardware using the A5 (S5L8940X/S5L8942X) and A5X (S5L8945X) chips found in devices like the Go to product viewer dialog for this item. Go to product viewer dialog for this item. , and iPad mini (1st Gen). The Role of Arduino in the Checkm8 Exploit arduino+a5+checkm8+exclusive
The isn't a party trick. It has three serious, practical uses. This is a fascinating and highly specific hardware
The answer lies in and deterministic timing . Go to product viewer dialog for this item
Unlike software-based checkm8 tools (like ipwnder32 or gaster ), the Arduino method is a "fire-and-forget" system.
When you run checkm1n (the payload inside checkra1n) on a Mac or PC, you are relying on the host operating system’s USB drivers. You press a button, and magic happens.