You compiled the incorrect branch. You are using a mod for Mercusys AC12G v1 (8M).
For Archer C5 v4 you should compile openwrt-23.05.5-rtl8367cd
or openwrt-23.05.4-rtl8367cd (more stable)
I think that backporting support of Archer C5 v4 to openwrt 19.07 is not a good idea. It need too many patches to get stable firmware. I use 19.07.10 version only for tests.
Ok, understand what only install snapshot, Right ???
snapshot
or
compile https://github.com/namiltd/openwrt/tree/openwrt-23.05-rtl8367cd
or
https://dl.eko.one.pl/test/ (e.g. file: luci-23.05-snapshot-r24111-5332351821-ramips-mt7620-tplink_archer-c5-v4-squashfs-sysupgrade.bin)
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