On the AXT1800 which has the same chip, you can login to Luci and go to menu Network / Wireless, select your wifi and and go to the Advanced tab and change the Country (ex: for 5G try US).
Solidus has OpenWrt with some extra packages prebuilt, all works well, only repeater on DFS channels I couldn’t get to work last time I tested.
https://flint.solidus1983.duckdns.org/?snapshots/r23168/targets/ipq60xx/generic