Aug 21 15:36:24 iPhone online-auth-agent(DeviceIdentity)[513] 
<Notice>: Error Domain=com.apple.MobileActivation.ErrorDomain Code=-16 "Server error: 400 (bad request) // 123 (29:ECC signature verification failed: signature incorrect.)" UserInfo={NSLocalizedDescription=Server error: 400 (bad request) // 123 (29:ECC signature verification failed: signature incorrect.)}
Aug 21 15:36:24 iPhone online-auth-agent[513] <Error>: Couldn't get device identity Error Domain=com.apple.MobileActivation.ErrorDomain Code=-16 UserInfo={NSLocalizedDescription=<private>}