Keep in mind that these devices are lacking the -usually present- EEPROM with the required wireless calibration data, which is offloaded to the main system flash (ART), combined with additional MAC messing. These are not user-replacable, while that doesn't mean that you can't get it working, but it's not going to be fun, at all (kernel/ mac80211 patching, DTS changes, firstboot/ uci-defaults changes, etc. pp.). It's usually more sensible to leave the archer-c7 v2 as-is (and qca9880-br4a is not exactly a relevation either) and to look for the intended mt7915 (or better, AP oriented) radios instead.
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