TP-Link TL-WR902AC AC750 v.3

[wlayher]

Hi, you can check if the device (or the new hardware revision) is supported by OpenWrt on the list of supported revisions for this device . So far it doesn't seem to be supported. The manufacturer's page you linked to even does not mention a new hardware revision besides v1 and v3 (Support page), which are both supported by OpenWrt.