802.11AC WiFi access point (castro valley)

Anyone have a spare 802.11AC access point – perhaps one that will run the alternate, open source firmware like DD-WRT or OpenWRT? I picked up an AC AP from a friend, but it does not have enough coverage for our entire house. Looking to build a mesh with DD-WRT or OpenWRT on the AP.

Appreciate the assistance and helping keep the electronics/computer parts out of landfills.

TIA!
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