There are news flooding the internet that soon some android users wouldn't be able to browse the Internet smoothly because of compatibility issues. Users who are still using Android version like 7.1 or lower, probably will soon fall in the same category who couldn't avail the seamless net surfing,
In order to avoid this, you need to upgrade your device with the latest Android version one of the latest certificate authorities had recently confirmed that their partnership with certificate authority IdenTrust which cross-signed Let's encrypt certificates are going to expire on September 1, 2021.
Problem is that some software that hasn't been updated since 2016 still doesn't support IRSG route X1 and this includes Android Nougat 7.1 and the older ones that are devices with these versions will no longer truck certificate but let's encrypt and hands with no trusted certificate and no domain using Aisha Jitu text one will not be able not to be compatible on the older versions.
Need you will be able to load them, However, there's a hack that can probably be saved to an extent that is installing Firefox Mobile because it supports Android 5.0 and above which may be the temporary solution but will not help you in the long run. Do have a look at the stats below to get an idea of how many devices are running an older version of Android.