[Solved] Invalid cert warning 21.02.0 release

[anon89577378]

Found the explanation and solution from @hynman -

OpenWrt 21.02.0 - First Stable Release

In 19.07 the HTTPS enabling libraries were not installed by default, so you did not connect with HTTPS unless you installed the needed SSL libraries (and the required libustream wrapper). Thus you did not receive the certificate warning, although the redirection option was set as enabled. For 21.02 the SSL + libustream libraries are installed by default so there is HTTPS capability. And if you sysupgrade with settings from 19.07, your old dormant setting from 19.07 with the "redirect to https"…

OpenWrt 21.02.0 - First Stable Release

It does actually default to "off" in 21.02 ("no redirection"), but your own old settings (copied from the previous 19.07 version) defaulted to "redirect to https if SSL capability exists" in /etc/config/uhttpd.