---
layout: post
title: Installing CA certificates on Android (also 16)
date: 2025-09-10 19:35 +0200
lang: en
categories: tech
---

Are you tired of getting "Private key required to install a certificate‎‏‎‎‏‎" when trying to
install a CA certificate under Android via the settings app?
(It never works via the file browser directly. You have to go via, and I only paraphrase, as I only have GrapheneOS here, no LOS:
Settings > something security > (more privacy and security?) > something login data/credentials/encryption > Install a certificate)

Just check

- The certificate must be *in PEM format*. If it is in DER, you get the error above.
- The file extension must be `.crt` or `.cer`. Not `.pem`. Otherwise you get a different error.