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How to Remove a Root Certificate from an Android Device Open your Settings, select Security. Choose Trusted Credentials. Select the certificate you'd like to remove. Press Disable.

You must manually turn on trust for SSL/TLS when you a profile that is sent to you via email or downloaded from a website. If you want to turn on SSL/TLS trust for that certificate, go to Settings > General > About > Certificate Trust Settings.

Digital certificates identify computers, phones, apps, and other devices for security. Just like you'd use your driver's license to show that you can legally drive, a digital certificate identifies your device and confirms that it should be able to access something. Important: You're using an older Android version.

If you want to turn on SSL/TLS trust for that certificate, go to Settings > General > About > Certificate Trust Settings. Under "Enable full trust for root certificates," turn on trust for the certificate.

Generate a new Certificate Signing Request (CSR). If you're still getting a certificate not trusted error, then you could have installed the certificate incorrectly. In that case, you can generate a new CSR from your server and reissue it from your certificate provider. Steps will vary depending on your server.

Scroll down and tap on "Profile." You will see a list of installed profiles and certificates. Find the one you want to delete and tap on it. Tap on "Remove Profile" or "Delete Profile."

Many times, this error occurs when the certificate installed on the email server isn't recognized by the Android device in question.

One possible cause of this error is that a self-signed certificate is installed on the server. Self-signed certificates aren't trusted by browsers because they are generated by your server, not by a CA. You can tell if a certificate is self-signed if a CA is not listed in the issuer field in our SSL Certificate tester.