Have you ever been asked to enter a password to decrypt the HTC One A9? This often happens when you restart the phone. If you are in this situation, you are required to enter your 4-digit PIN code in order to decrypt then gain access to the phone. After entering the correct PIN the Android robot will be show up and the device will be booted up. You can take a look at the Security Settings to change the PIN in case you forgot it.
As you may know, this phone was shipped with Android 6.0, the latest version of the Android OS. There are several major improvements brought by Marshmallow, one of which is related to privacy and security. Redesigned app permission is one of them, now you can turn the permission on or off for your entire installed apps, you may also deny any kind of permissions requested by the app while keeping the app running.
Regarding, a password request to decrypt HTC One A9, it’s most likely one of the Marshmallow features. According Android Compatibility Definition Document for Android 6.0, a device that come with Marshmallow and have the Advanced Encryption Standard (AES) crypto performance above 50 MiB/s, the full-disk encryption must be enabled by default after the user has finished the setup. If you have not specified a passcode or it is disabled, the system will use a default passcode.
If it’s like previous HTC devices, the encryption settings can be found in Settings > Storage > Phone storage encryption. To disable encryption on HTC One A9, you can try to factory reset the phone, but remember to backup the phone’s contents before resetting.
We think this feature is very useful for those who are caring about its phone security. As we said earlier, if it’s enabled by default, then this device has an excellent crypto performance, so, there’s no impact on the phone’s overall performance.