LuCI Firmware Upgrade 19.07.4 -> 21.02.2

Hi All,
Will upgrading from 19.07.4 -> 21.02.2 mean that I will loose all my settings and need to reconfigure everything on my router?

I've tried to upgrade with "Keep settings and retain the current configuration" checked, but after it spins for a few seconds, it just reloads the browser window and it's still the same version.

Are there logs I can check to see what is happening, please?

Thank you.

changes in openwrt requires you to reset the settings when going from 19 to 21.

try doing a sysupgrade from OS instead.