One of key certification centers Let’s Encrypt has brought good news for owners of smartphones running older versions of the Android operating system.
Postpone panic
The thing is what’s still in last month Let’s Encrypt announced transition to signature generation algorithm with using its own

By statistics on 33,8%
Initially in Let’s Encrypt announced the deadline — September 2021. But now these dates have been postponed until 2024 year. So while users are not lose access to sites, but pull with update is still not worth it.
Source: Let’s Encrypt