How do I factory reset the range extender?
Press and hold the RESET button for 1 second while the extender is powered on. Alternatively, log in to the web management page at http://tplinkrepeater.net, navigate to Settings > System Tools > Backup & Restore, click FACTORY RESTORE and wait a few minutes until the device reboots.
From the official TP Link Re220 Range Extender manual, page 48
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