IOS models below version 16 cannot trust certificates generated by zeroSSL

[Felix-brave]

On September 13, 2025, I re generated a new certificate using zeroSSL. After binding the certificate to the domain name, I requested the domain name bound to the new certificate on devices below iOS 16.2 and was informed that I did not trust the certificate. Here is the result of my generation

Is this due to the latest updated ACME version? Version 3.1.2 is still in the development stage. Are there any issues ？

[github-actions]

Please upgrade to the latest code and try again first. Maybe it's already fixed. acme.sh --upgrade If it's still not working, please provide the log with --debug 2, otherwise, nobody can help you.