How do I reset the RE220 extender to its factory default settings?
Use a pin to press the RESET button for 1 second while the extender is powered on, and the extender will reboot. Alternatively, log in to the web management page at http://tplinkrepeater.net, go to Settings > System Tools > Backup & Restore, and click FACTORY RESTORE. It is strongly recommended to backup your current configuration settings before resetting. (Page 52)
From the official TP Link Re220 Range Extender manual, page 52
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