The TP-link TL-WR841 v11 has the Atheros chipset, but you have posted your query in the Broadcom forum. DO NOT try to flash an Atheros firmware on a Broadcom device (or vice versa) or you will ruin your router.
Check the Atheros forum for support. I believe the current build may be found here:
The "tplink_tl-wr841ndv11" folder should have what you need, as the "ND" suffix merely indicates detachable antennae. Be sure to read the "how to" guides before attempting a flash. _________________ Netgear R7000: v3.0-r54248 std (11/29/23)
EdgeRouter-X: EdgeOS v2.0.9-hotfix 7