On modern systems the write-protection is gated via the security chip, which responds to various key combinations. My understanding is that it's possible to re-

On modern systems the write-protection is gated via the security chip, which responds to various key combinations. My understanding is that it's possible to re-enable the write protection after flashing and the machine will behave identically (other than that updates from Google will fail to apply due to the system no longer considering Google a trusted authority)