I have one of these routers (https://www.speedguide.net/routers/winstars-ws-wn532a3-ac1200-smart-dual-band-wi-fi-4293) and was getting frustrated by the factory firmware, both from it's limited functionality, and it's inherrent security issues.
It did not appear to have an official supported build of open wrt, however after much searching I found that it shared the same chipset as this supported device https://openwrt.org/toh/wavlink/wl-wn575a3 and I can happily report that this build works perfectly on this device, following the same installation instructions from that page.
Hope this helps someone.
Is there somewhere I can request that the device be added to the list of devices, which work with the current build?