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This support page has the instructions for enabling deep sleep:

Support for WeMos D1 ESP-Wroom-02 Nodemcu

edit by Guy: in short, solder/connect pins as shown circled in red:

image of board

This support page has the instructions for enabling deep sleep:

Support for WeMos D1 ESP-Wroom-02 Nodemcu

This support page has the instructions for enabling deep sleep:

Support for WeMos D1 ESP-Wroom-02 Nodemcu

edit by Guy: in short, solder/connect pins as shown circled in red:

image of board

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This support page has the instructions for enabling deep sleep:

Support for WeMos D1 ESP-Wroom-02 Nodemcu