[OnKey Founder: iPhone 11 and Earlier Models Have Hardware Vulnerabilities That Cannot Be Fixed Through System Updates; Not Recommended for Storing Mnemonic Phrases] Odaily Planet Daily reports that OnKey founder Yishi posted on the X platform warning that using older iPhones as cold wallets for crypto assets may pose security risks. The checkm8 vulnerability, present in the BootROM of iPhones from the iPhone 4S to iPhone X, and the usbliter8 vulnerability, disclosed in June of this year, affect iPhone XS, XR, 11 series, and the second-generation SE. All involve the device's underlying boot code and cannot be fixed through iOS system updates. After gaining physical access to the device, attackers can execute code via USB before iOS boots; even airplane mode cannot prevent such attacks. Yishi recommends that iPhone 11 and earlier models not be used to store mnemonic phrases. Users already using such devices to store mnemonic phrases should generate a new mnemonic phrase and migrate their assets in a trusted environment, rather than simply changing the wallet address associated with the original mnemonic phrase. In addition, users should update their systems promptly, use more complex devices and wallet passwords, avoid charging via public USB ports, and be wary of physical attacks that may occur when devices are out of their control for extended periods. Previously, OneKey founder Yishi posted on the X platform advising users to use iPhones as cold wallets, but only recommended iPhone 17 or newer models.