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Factory reset
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You can perform a factory reset by pressing the button inside the S32 and E32 Gateway for 10 seconds.
If you have a Premium II with the latest firmware 2.2.2b0 you can use a metal pin to shortcut pins D3 to D2 on the Wemos for 10 seconds.

If the above methods do not work, you have to upload the firmware again. See: :ref:`HERE <Updating or downgrading the Gateway firmware>`.

Where can I find the button?
============================

Gateway S32
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There is a small button right next to the USB connector called 'IO0'. If you press it for 10 seconds, you device will restart and reset all settings to factory default.

.. image:: ../images/hardware/ems-gw-s32-reset-button.JPG
  :width: 400
  :alt: EMS Bus Gateway S32 reset button

Gateway E32
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There is a button on the board called 'reset' or 'button'. If you press it for 10 seconds, you device will restart and reset all settings to factory default.

.. image:: ../images/hardware/ems-gw-e32-reset-button.JPG
  :width: 400
  :alt: EMS Bus Gateway E32 reset button

Gateway Premium II and older
----------------------------

The Gateway Premium does not have a reset button. Although there is a button on the Wemos called 'reset', it's actually just a reboot button.
Pressing it will only restart the Wemos, it does not reset anything.

If you are on firmware 2.2.2b0 you can use a metal pin to shortcut pins D3 to D2 on the Wemos for 10 seconds to reset EMS-ESP.