TP Link EAP225 - Flashing firmware

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[OpenWrt Wiki] TP-Link EAP225 series

https://openwrt.org/toh/tp-link/eap225

In the instructions it starts "The Outdoor, Wall, EAP225 v3, and later models can be installed via the web interface after disabling FW." - Can I check what FW refers to? I dont want to muck this up.