A post by @WuBlockchain on X.

OneKey founder Yishi warned that older iPhones carry unpatchable BootROM-level chip vulnerabilities that could compromise crypto wallet seed phrases stored offline, even on factory-reset devices in airplane mode. Affected models include iPhone 4S through X, exposed via the checkm8 exploit, and iPhone XS, XR, 11 series, and second-generation SE, exposed via usbliter8, disclosed earlier this year. Because the flaws reside in hardware, they cannot be fixed through iOS updates, and attackers with physical access and specialized tools could exploit them via USB. On XS and 11 models, passcodes and the Secure Enclave still provide a layer of protection against direct seed phrase access. Yishi advised users to generate new seed phrases in a trusted environment, move assets, and shift to newer devices. The warning underscores hardware-level security risks for self-custody practices, with attention likely to shift toward hardware wallet adoption and further disclosures on usbliter8.