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Shelly Duo RGBW 9W 800lm RGBW Bulb (3800235262306)
E27
Shelly Duo RGBW 9W 800lm
GPIO #Component
GPIO00 None
GPIO01 None
GPIO02 None
GPIO03 None
GPIO04 None
GPIO05 PWM 4
GPIO09 None
GPIO10 None
GPIO12 PWM 2
GPIO13 PWM 1
GPIO14 PWM 3
GPIO15 None
GPIO16 None
GPIO17 None
Configuration
{"NAME":"Shelly Duo RGBW","GPIO":[0,0,0,0,0,419,0,0,417,416,418,0,0,0],"FLAG":0,"BASE":18}
See Tasmota documentation on how to configure RGBW lights to your needs.

Correct OTA mgos firmware

Pogo clip for serial flashing

White blend mode: SetOption105 1

Virtual CT mode: SetOption106 1 and SetOption107 0

Troubleshooting

After replacing the Shelly Firmware by Tasmota and connecting the buld to your wifi, the Tasmota Web-UI might not come up, although the device IP is connected. To fix the issue, recover the bulb via PowerCycle, connect to the “tasmota-…” wifi again and open the Tasmota Web-UI. Instead of selecting your network, open the Console via URL http://tasmota-ip/cs and enter reset 1. Now you can connect the bulb to your network and the Web-UI will come up as expected.