You can install Mintsifry certificates on Android through the official "Gosuslugi" portal and your device's security settings. The process may vary slightly depending on the OS version and the manufacturer's custom shell.

Step 1. Download the files:

• Open the "Gosuslugi: Mintsifry Certificates" page or use the instructions in the Gosuslugi app;
• Download the root (Russian Trusted Root CA) and intermediate (Russian Trusted Sub CA) certificates. Unzip the downloaded archive if necessary.

Step 2. Install the certificates into the system:

• Open your phone's "Settings";
• Type the word "certificate" in the search bar;
• Select "CA certificate" (or "Install certificates from storage" / "Certificate authority");
• Confirm the action by entering your device's PIN code, password, or pattern lock;
• In the file manager that opens, find and select the downloaded certificate files one by one (with the .cer extension);
• When prompted for a name, enter the file name (e.g., Russian Trusted Root CA or Russian Trusted Sub CA) and select the "VPN and apps" usage type (if required).

Step 3. Clear browser data:

• Go to your browser's settings (Chrome, Firefox, etc.), open the privacy section, clear cached images and files, and then restart the app.