I'm new to the forum. Sorry if I missed any related postings.
I've just installed version 21.02.0-rc2 a few days ago on an x86-based system (old Asus-ePC) in a cascaded router environment for testing purposes and to learn how the system behaves (before installing 21.02 stable later on for production use on a Linksys device).
As expected I had to install several hardware-specific additional packages to activate WLAN. All went fine, I can access the internet, all devices in LAN can connect to WLAN devices and vice versa. Great distribution!
Now I saw that rc3 is out. To understand the mechanisms behind and to gain experience for further updates I wanted to upgrade from rc2 to rc3 without loosing the additional packages and corresponding config files.
I found https://openwrt.org/docs/guide-user/installation/generic.sysupgrade#reinstall_user-installed_packages and https://openwrt.org/docs/guide-user/advanced/opkg_extras which both describe the way well.
However, how do I add the functionality of opkg extras? I do not understand how to proceed. Or where is my thinking error?
Can I use sysupgrade and opkg extras to complete the update without the need to reinstall and reconfigure packages?
Thanks a million for your help and hints!