When Samsung S4 changes the screen lock mode, the existing administrator, encryption policy, or certificate storage policy is disabled.

In addition to passwords, the screen lock settings are dimmed and the message "Saved By administrator, encryption policy, or certificate" is displayed, this is because the device encryption or external SD card encryption function is set in the mobile phone. To change the screen lock mode, decrypt the device or decrypt the external SD card.
Operation:
1. Cancel device encryption. Method: set-security-decrypt the device-click "decrypt the device"-enter the lock screen password-click "decrypt the device" at the bottom of the screen again-wait for completion.
Note: When device encryption is canceled, the mobile phone needs to connect to the charger.
The ghost official website provides graphic functional tutorials on the decryption device features. For details, refer:
Http://skp.samsungcsportal.com/integrated/popup/FaqDetailPopup3.jsp? CDN site = cn & seq = 885144
2. Cancel SD card encryption. Method: set-security-encrypt external SD card-click "close" in the lower left corner-enter the password-click "application" and wait for decryption.
Decrypt the device or external SD card and then change the screen lock mode. Operation: set-lock screen-screen lock-enter the Lock password after clicking-select another lock method, such as "slide unlock.

Samsung digital service platform: http://support.samsung.com.cn/ask

More cases are about certificate issues:

Set-security-clear certificate

Disabled.

Use the apowersoft mobile assistant to manage SamSung mobile phones.

VPN: Delete the added VPN and disable it.

From: http://blog.csdn.net/pipisorry/article/details/38474827

Ref: http://zhidao.baidu.com/question/680491907759623812.html