How do I factory reset the A9 Wireless N300 Universal Range Extender?
Use the end of a paperclip or similar object to press and hold the Reset button for about 8 seconds, then release it to restore the extender to factory settings. This will clear all settings and return the device to its original configuration.
From the official Tenda A9 Wireless N300 Universal Range Extender manual, page 1
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