The Secure Enclave&#x27;s back-off delay is not hardware enforced, it&#x27;s enforced by the software running in the SE. The big question is whether the SE&#x27;s software can be updated without first unlocking the device and without wiping the user&#x27;s data. If such an update restriction is in place, then newer phones would not be vulnerable. If no such restriction is in place then newer phones are vulnerable, they just need the SE software to be modified instead of the main OS software. So far, I have not been able to find any concrete information about whether or not the Secure Enclave in current phones have such restrictions.