Setting up a bridged wireless client requires specific support from the wireless driver that is operating your wireless radio IC or SoC. Most drivers available for OpenWRT do not support this operation mode, the Broadcom proprietary driver being a notable exception. However, using this proprietary driver requires that you also have a Broadcom wireless chipset on your router.
Since your router model is using an Atheros chipset, I recommend you look at the following wiki page for steps on how to configure a pseudobridge with the help of relayd daemon: https://wiki.openwrt.org/doc/recipes/relayclient
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(Last edited by Antek on 25 Sep 2017, 07:24)