[Discussion] "DST Root CA" expiry and what it means for legacy iOS

On newer legacy versions (like iOS 10), you must go to Settings > General > About > Certificate Trust Settings and toggle the switch for the newly installed certificate to "On". Essential Tweaks for Legacy Devices

To fix these errors, you must manually add modern root certificates to your device's trust store.

Certificates. ISRG Root X1 CA (Let's Encrypt) Trust. The original certificates can be found here: ISRG Root X1 CA (+Let's Encrypt) InvoxiPlayGames IPG's Cydia Repo

Messages stating Safari "could not establish a secure connection" to popular sites.

Errors like "SSL -9807" or "Verification Error" when adding new repos.

Open Safari on your legacy device and go to the iOS Certificates page provided by InvoxiPlayGames.