Xiaomi Phillips Zhirui Bulb with Tasmota

Connect a USB to UART adapter to the module

First remove the dome of the bulb. A good possibility is to cut around the dome with a cutter knife. Afterwards you can lift the dome with a flat object
Than the isolation around the middle PCB must be removed. Simply cut a little on the sides of the module.
Now there you can see six contacts

IO0	IO15	3.3V	RXD	TXD	GND
contact on the left					contact on the right

Connect a simple USB to UART adapter to the module (Attention: Make sure it is a 3.3V adapter or the jumper is set to 3.3V. 5.0V will damage the module)
Connect IO0 with GND
I used this adapter: USB zu TTL konverter UART modul CH340G (This one can be set to 5.0V or 3.3V)
It is sufficient to supply the esp8266 module (Sonoff, …) via the 3.3V from the USB adapter. Never connect mains power to the module!
Now you can flash Tasmota with this instruction: https://chrigi.me/wordpress/upload-tasmota-to-an-esp8266/

Go to Configuration –> Configure Template
Set Name to „Generic“ and Based on to „Xiaomi Philips (48)“. GPIO0 to GPIO16 and ADC0 should now automatically configure themselves correctly
Save the configuration

Now the basic configuration are done. The cable can be removed and the bulb can reassembled