So, I did some reading here around in the forum and found a few posts on this device. This one Upgrading firmware on Archer C20 v5 in particular helped me make up my mind, so I unchecked "keep settings" just as @ercolino suggested, check "force upgrade" hit "continue" and now is running "OpenWrt 22.03.4 r20123-38ccc47687" and so far, so good. 
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