I am not being able to see my Firebase Web App on old Android Devices due to SSL error.
There is a question about this, but the answer doesn't say how to solve it.
Is there any solution for this?
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SSL/TLS support is based on the Android version. There's no way for Android end-users to fix this issue unless to upgrade to a newer Android version if possible.
In this case, based on Qualys SSL Server Test, the site only supports TLS 1.2.
TLS 1.2 is only supported since Android 4.4.2 KitKat, where Android 4.3 Jelly Bean and before only supports TLS 1.0 (among other older protocols).
The only fix is to configure the server to allow other protocols and/or cipher suites (the specific depends on the server and out-of-scope of this site).