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Flashing is much easier. GPIO0 is Button0. No need to unscrew the PCB. See also https://projetasgarddiy.fr/2018/05/23/flasher-un-sonoff-dual-r2-avec-espeasy/ for photo.

Siegfried Loeffler 2019-02-10 12:01:43 +01:00
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Sonoff-Dual-and-Dual-R2.md

@ -51,6 +51,8 @@ Programming the Sonoff Dual is more difficult because the on-board-button is not
1. Unscrew the Sonoff Dual from the housing and access the underside of the PCB You can find GPIO0 on one side of a resistor as shown in the second image.
2. GPIO0 can be found on the small inter layer [via](https://en.wikipedia.org/wiki/Via_(electronics)) pointed at in the first image. Attention: If the via is covered by silk screen (green) you need to expose the underlying conductive (copper) by careful scratching it off.
Another (easier) way is to simply bridge between "Button0" and "GND" on the 2nd header. "Button0" is actually GPIO0.
### Restricted Button Functionality
Please be aware, that the button on the Sonoff Dual will initially not have any functionality!