May 2026

You can find this device anywhere , but it came with a proprietary firmware .

If you open the case , and after connecting to your computer via a USB to TTL UART adapter , you can flash the firmware with Tasmota . More information on Tasmota Device page .

Now the tricky part happend when the device is already flashed , and if for some reasons you want to reflash via OTA , the device does not have enough space , to flash a full new firmware .

So you need to proceed in 2 steps :

1. Flash with a minimal firmware ( http://ota.tasmota.com/tasmota/release/tasmota-minimal.bin.gz ) , reboot
2. Flash with the final firmware .

For the final firmware you can flash with the regular firmware http://ota.tasmota.com/tasmota/release/tasmota.bin.gz , or with one custom firmware i provide .

I built a custom firmware that include the right Tasmota template .

1. Tasmota version v15.4.0 tasmota_v15.4.0.bin.gz

NOW If you don't have a USB to TTL UART adapter , i sell on Ebay this device , with Tasmota pre-installed .

Please take a look at here .

• 1 device with Tasmota v15.4.0 for 18$
• a kit of 2 devices with Tasmota v15.4.0 and free shipping for 42$ with free shipping