My website is suddenly showing SSL errors?

Starting some point in 2024 some websites can fail loading in Fully Kiosk on Android versions older than 7.1.1. This is because of the missing ISRG Root X1 root certificate used by many websites certificates signed by Let’s Encrypt. Android Webview can only use the trusted root certificates installed in your Android device. You can ask your website provider to use a Certificate supported by the older Android versions. Or you can download and install ISRG Root X1 and Let’s Encrypt R3 certificates manually on your device in Android Settings > Security > Credential Storage > Install from SD Card (or similar). In Fully Kiosk Browser 1.55.3+ we allowed the ISRG Root X1 and ISRG Root X2 certificates to mitigate this issue.