Upgrade cancelled LuCI

I've a full working TP-link C20i OpenWrt 21.02.3: following instructions at https://openwrt.org/docs/guide-user/installation/generic.sysupgrade, I've upgraded it to 21.02.3 found at https://openwrt.org/toh/tp-link/archer_c20i but LuCI was missing and I'd to install it via opkg; now Firmware version is "OpenWrt SNAPSHOT r20062-4a1dcaf848 / LuCI Master git-22.189.49133-e193259": I wish to come back to "non development" stream, any hint(s)/tip(s)/suggestion(s)?

Thanks in advance,
my best

Download the sysupgrade image of 21.02.3 for your device. You can use the LuCI firmware upgrade page to flash the system. But do not keep settings when you roll back the version.

That is it.