Frequently Asked Questions (FAQ)
For Android version 10 or higher, location (GPS) must be switched on. Otherwise the WiDI will not be found by Android and therefore also by the i-record app.
To connect to the i-record server with the i-record app, a current certificate from Let's Encrypt is required. On 30 September 2021, the DST Root CA X3 cross-sign certificate expired. It was replaced by a separate ISRG Root X1 certificate from Let's Crypt. On newer Android devices, this ISRG Root X1 certificate was installed automatically. On older Android devices with an Android version < 7.1.1, however, this does not happen automatically. If the technician now wants to connect to the i-record server (for login or to synchronise the data), the following error message appears: "401: Login to content server failed".
For these older Android devices, the ISRG Root X1 certificate must now be installed manually. Let's Encrypt provides a new ISRG Root X1 certificate on their website, which will solve the problem of the failed login. Therefore, download the certificate from the following link: https://letsencrypt.org/certs/isrgrootx1.pem.
Once the pem file has been downloaded or copied to your mobile device, the certificate can be installed in two ways:
a) Open the Android file browser and switch to the pem file you have just copied or downloaded.
Click on the file name to install the certificate (for VPN and apps).
b) Alternatively, the certificate can also be installed on the tablet via the Android menu.
(For Android 5.1.1 via: Android settings -> General -> Security -> Credential storage -> Install from device storage)
If the certificate was installed correctly, i-record can be used again as usual. The login to the i-record server no longer returns an error message.
Message from Let's Encrypt about the problem described: https://letsencrypt.org/de/docs/dst-root-ca-x3-expiration-september-2021/