- Download Lets Encrypt CA Root for Android: ISRG Root X1
- Settings -> Advanced -> Encryption & Credentials -> Install a certificate -> WiFi-certificate
- or Internet/WiFi settings -> Network Preferences -> Install certificates
- or search settings for "WiFi Cert" and select WiFi-certificate
- Select isrgrootx1.pem (downloaded from step #1)
- Name it something like "ISG X1"
- Go to wifi settings and select "ToorCamp" network