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SOFT RESET

To soft reset your eero, hold the reset button until its LED flashes yellow (7 seconds)
*After a few moments, the eero LED should return to solid white and appear with a green outline in the eero app.


HARD RESET

To hard reset your eero, hold the reset button until the LED flashes red (15 seconds)
*After a successful hard reset, the eero LED light will reach a flashing blue state, indicating that the eero is ready to be set up again.


Link: https://support.eero.com/hc/en-us/articles/215473703-How-do-I-reset-my-eero-