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I had the same problem getting Android to really install the certificate, until I found this site which describes a method that worked for me. It boils down to the following steps: Create a private key and public x509 certificate with v3_req extensions and enabled as a CA: sudo openssl req -x509 -nodes -days 365 -newkey rsa:4096 -keyout ...


2

Guess you're using Kitkat (or newer) on that device? I'm afraid in that case you've got to live with that (you will always receive this warning as soon as you've installed a custom certificate – see official changelog regarding this1) – or root your device and install certificates as "trusted certificates" only. How to install a certificate as "trusted ...


1

The certificate has most likely been added to your "trusted certificates". You can delete it in Settings › Security › Trusted Certificates then (Settings referring to the Android System Settings, not those of the browser used): chosing the "User" tab should display certificates you've added as user (as opposed to those the system already brings along, or you ...


1

Just had the same issue. Go to Settings > Security > Install from storage. Locate your certificate file and install it.



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