How do I reset my TP-Link TL-WA850RE extender to factory defaults?
Press and hold the RESET button on the device until all LEDs turn on momentarily, then release it. Alternatively, visit http://tplinkrepeater.net and go to Settings > System Tools > Backup & Restore to click Factory Restore. (Page 27)
From the official TP Link TL Wa850re 300mbps Wifi Range Extender manual, page 27
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