If you use a device running an Android version prior to 7.1.1, beginning January 11 your access from that device to this site and many others will be impaired. (7.1.1 was released only four years ago, and a third of all Android devices are running older versions.) When you attempt to visit the apoe4.info website from any browser other than Firefox Mobile, your device will complain of a certificate error and refuse to load your request. We think but are not certain that the Tapatalk forum browser used by some members will also fail.
- Unique among Android web browsers, Firefox Mobile will continue to work. If your device runs Android 5.0 or later, you can install it from the Play Store.
- Replace your phone with one that runs Android 7.1.1 or later.
- Use a PC, Mac, or iPhone to access apoe4.info.
What Android version am I running?
Follow this guide from How-To Geek.
A deeper dive.
This is the announcement from Let's Encrypt:
Standing on Our Own Two Feet