Let’s Encrypt announced that an IdenTrust-provided root certificate provided by its service will expire on September 1, 2021. Let’s Encrypt runs with its own root certificate called ISRG Root X1 and is supported on many devices, but there is one problem.
Unfortunately, millions of devices with Android versions below 7.1.1 cannot connect to websites with Let’s Encrypt certificates due to the difficult update situation of Android. Not only does this affect websites that you navigate to in your web browser, but apps that connect to a website to get data also fail to connect.
To fix the problem, Let’s Encrypt will make it possible to provide an alternative certificate chain that leads to the old root certificate for better compatibility. This is a temporary solution for site administrators who, in the longer term, can display a banner asking older Android users to switch to Firefox Mobile (which updates certificates independently of Android) no longer supporting older versions of Android and return to HTTP for older devices or switch to a certification authority that is installed on older devices.
Let’s Encrypt recommends that users of older Android devices install Firefox Mobile. As mentioned earlier, Firefox has its own list of trusted root certificates. This allows websites to continue working for the next year after the old root certificate expires.
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