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:::

The main determining factor for whether a platform can validate Let's Encrypt certificates is whether that platform trusts the self-signed ISRG Root X1 certificate. As Let's Encrypt announced a [change in its chain of trust in 2024](https://blog.cloudflare.com/shortening-lets-encrypt-change-of-trust-no-impact-to-cloudflare-customers/), older devices (for example Android 7.0 and earlier) that only trust the cross-signed version of the ISRG Root X1 are no longer compatible.

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You can find the full list of supported clients in the [Let's Encrypt documentation](https://letsencrypt.org/docs/certificate-compatibility/). Older versions of Android and Java clients might not be compatible with Let's Encrypt certificates.

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SSL.com is highly compatible, being accepted by over 99.9% of browsers, tablets, and mobile devices.

SSL.com certificates are [cross-signed with Certum](https://www.ssl.com/repository/) and the [CA that cross-signs intermediates](https://crt.sh/?caid=840) is from 2004.

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#### Other resources

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#### Browser compatibility

Refer to [Sectigo documentation](https://www.sectigo.com/knowledge-base/detail/SSL-Browser-Compatibility-1527076085062/kA01N000000zFJt).
Refer to [Sectigo documentation](https://www.sectigo.com/resource-library/sectigo-certificate-authority-root-keys).

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